A/N: Okay so this idea came to me, well shamefully enough this was one of those midnight ideas that actually began to make sense enough to write. As far as Flash goes, spoilers for all of it, specifically season 3, as far as Glee goes possible spoilers for everything as well. I'll be mixing and matching. Since Darren Criss played Music Meister and Grant Gustin played Sebastian, I figured why not attempt a bit of crossover fun. This is a Flash post musical episode AU with a bit of an It's A Wonderful Life spin.

Chapter One:Regret

Barry was one of three people in STAR labs at the moment. HR was in the workshop somewhere trying to "help" with one of Cisco's gadgets (odd considering Cisco had left an hour ago) and Barry himself was walking to the medbay, walking...it was a strange sensation, strange but welcome. There was only so much running he could do. He didn't feel much in tune with the speed force at the moment. In fact it seemed more interested in lashing out. If you want me to work with you, why won't you work with me? Barry wondered. But of course there was no answer. Even the near constant momentum of lightning was dulled by anger and grief, petulant refusal to cooperate. He pushed open the door to the medbay and took the spot, the same spot he'd been sitting in every night for the past two weeks since they had gotten back. Since he'd managed to get Wally back.

The younger speedster was out cold, finally asleep and unmoving save brief shivers which sent the cot squeaking. His vitals were normal, constant, speedster safe, unlike Barry's own. He didn't need Cait's equipment to know that his heart rate was thumping as quick as a rabbit's and his breathing was a shallow gasp. The sob was threatening to break through. Why did he get stuck with the burden? Jay was gone, Jesse was gone, Wally was compromised because of the force that was supposed to help them all. It had tortured him, practically broke him, and it was supposed to keep them safe. Hell if he felt safe at this moment. Even his proposal had been marred by the fear for Wally, how could he ask Iris for forever when both of their minds were on everything but each other? He had, she'd said yes, but the happiness was muddied.

He didn't want to be a hero. Just once he wanted the burden gone.

"How's he doing Flash?" The voice was copper, and Barry felt himself stiffen as the identity registered, as he zipped through memories the lightning assisting in that regard, expert at further angering and traumatizing him: Kara and Moon River, pseudo Iris and Joe and Martin Stein and Merlyn and Cisco acting the parts of New York gangsters, Super Friends, the fear as the bullet made contact and he knew he'd probably die, until Iris.

Sure enough, he turned to see him. "Music Meister…" His voice lacked the same edge...and the man, warlock, alien, whatever he was, seemed to know it.

"Well isn't this a sight? It seems I was right after all." Music Meister shook his head. "It's a shame. Kid Flash did put up such a wonderful fight too. I guess it must have taken more than it seemed. Speed force, such a nasty, nasty master, wouldn't you say Barry?"

"What do you want?" Barry narrowed his eyes.

"Tsk...so impolite. You know it isn't what I want Barry. It's what you want."

"Like hell!"

"Oh really, so it isn't true that you wanna hang up the cowl?"

Barry's breath caught, strangling any reply as his gaze drifted to Wally, his thoughts drifting to Iris, to Joe, to Cisco and Caitlin, to Jesse, to his team. He'd hurt every one of them since becoming the Flash. He'd messed with their lives. It was true, he and Cisco and Caitlin had moved past the post Flashpoint ramifications as much as they could, but he still saw Caitlin clutching the necklace with tears threatening to fall. He saw the circles under Cisco's eyes as the major holidays drew nearer: one more to spend without his brother. The one disadvantage of being Vibe is that he knew what could have been, and Barry didn't hold any stray anger that remained against them. They were his team, and it was his job to shoulder the burden. But what hurt the most was knowing that what Iris was currently facing was his fault. Her possible death, one possible future, the prospect of Joe losing his daughter, what they were currently facing as Wally struggled with what he saw in the speed force. It was his fault. And it was enough to make him consider a what-if, sure. But he wouldn't admit that to this clown. "No." The strain in his voice made Barry wince.

"See," Music Meister looked down at Wally laying in the cot, not awakening despite the argument going on mere feet away. "I think you're lying Barry, and I think you know that too. And you need my help."

Barry shook his head. "See, I'm not taking any more help from you. Now get out before I lock you up."

"You forget that cell doesn't hold me Bar…" He grinned. "Just relax."

Barry felt his gaze become transfixed by Music Meister's as his eyes changed from brown to blue. The last thing he recalled was Music Meister vanishing as he heard his name being called.

"BA!"

HR was at a loss. Wallace had finally fallen asleep, so waking him was not an option that the man wanted to consider. Nightmares were tricky things, and if you could sleep without them, waking was not something that should be taken lightly. He saw Barry's cell phone sticking out of his pocket and pulled it out placing it on a side table before lifting the younger man onto a neighboring cot.

"Alright, alright, think HR," The man put his hands to his head and paced the length of the room before picking up Barry's cell phone. The time read 4AM, but this was an emergency. He scrolled through the phone and set it up for a conference call.

"Come on, pick up, pick up…"

"HR…" A sleepy voice broke the ringing of the phone in his ear. "What's wrong with Barry?"

HR glanced over to the other speedster then back to Barry as he tapped his hand against his leg impatiently waiting for an answer. "Nothing you need concern yourself with. I'm calling in the cavalry, you can...uh...just focus on getting yourself feeling better."

"You're kidding….right?" Wally sighed. " Barry's in trouble and you thought letting me sleep was an option?" He sat up and reached for the shoes at the side of the bed.

"What's going on with Barry? Why are you calling on his phone? Did something happen?"

HR tapped the speaker button as Caitlin's voice grew more agitated.

"Someone had better explain."

"Yo, it's like 5 in the morning, this couldn't wait another two hours?" Cisco sighed.

"I don't actually know what happened. I was working on modifying the goggles." HR said. "I heard shouting coming from the medbay and came in to see BA here falling to the ground unconscious."

"Whoa, whoa, you touched the goggles?" Cisco demanded.

"Not the point Cisco." Caitlin said.

"I'll go call Dad and Iris." Wally shook his head wanting to get out from the argument so he could think straight. Even via phone, those three could never reach consensus.

"Did you actually see who attacked Barry?" Cisco said.

"Um...I think I might've seen...you know actually...no. But he did sound familiar."

"Okay, so I'll breach over and pick up Cait. We'll be there in a few minutes." Cisco said. "Try not to screw anything else up...okay?" Cisco disconnected from the line.

"He didn't mean it HR." Caitlin sighed. "We're just worried is all."

"That makes all of us Caitlin." He sat himself in a chair. "That makes all of us."

A/N: So that's the start. This is going to include fun moments and moments of drama in equal measure. I hope you'll join me for this unconventional crossover adventure.