But Tony (first voice), Toby (second voice, has more of an 'E' sound to it), and their mom Annie (Third voice, highest pitched) sing it.

Tony was kicked out of his band and can't get back in no matter how hard he tries, so Toby and Annie try to make him feel better. Dom hasn't heard what happened yet.

'I just wanted to be part of a band...'

Midi by DerpySlurrpe 2k - https://www.youtube.com/watch?v=wH88fxUQDhw

UPDATE: I changed Tony's voice a bit.