Optimus Prime:
Song that describes him: Heroes by Alesso and Tove Lo
Favorite genres: Classic rock, classical

Bumblebee:
Song that describes him: Teenage Dirtbag by Wheatus
Favorite genres: Punk rock, electronic, rap, pop

Bulkhead:
Song that describes him: Stronger Than You by Garnet from Steven Universe
Favorite genres: Country, rock

Prowl:
Song that describes him: Crawling in the Dark by Hoobastank (weird name, I know)
Favorite genres: Alt rock, soft rock, calming music? (he's a total slut for Halsey and he doesn't even bother hiding it.)

Ratchet:
Song that describes him: Landslide by Fleetwood Mac
Favorite genres: Jazz, Frank Sinatra, if that's a genre

Sari:
Song that describes her: Cool Kids by Echosmith
Favorite genres: Pop, rap, punk, dance, electronic, Hannah Montana (when she was 8 at least)