I've made a few
bike vids (RL), most of them too long for youtube, but they are initially for myself, & I have always put music on them. Anyway the feedback I've had is about 50/50 as to music or no music. Yet when I have watched other peoples bike vids, I usually can't stand the music they have put over them & would rather watch without the music.
Most people it seems do want to hear the engine noise, the trouble with my bike vids is the wind noise drowns out the engine noise.
Yet any that I've watched I've not wanted music on it. I just want the engine noise.
As for copyright, whilst most stuff is indeed copyrighted, it seems to depend on who owns the copyright, some enforce it, some dont, some bands seem rather pleased that you are using their music, whilst others actively police it & will stop you, its purposes often affects their decision.
A while back I made a RL F1 Vid. FOM objected big time & had my account banned claiming it was their vid (even tho it wasnt, filmed & edited entirely by me), anyway I ended up putting it on some private webspace that I had at the time, & while FOM kept hassling the website administrator (which just happened to be me) to take it down, the BBC gave permission for me to use The Chain on the vid, they didnt have a problem with it.
I would say if you are making it mostly for yourself & you want music on it, then put music on it.
(so tempting to put the link on for the F1 Vid, but the website runs out in March & I bet FOM keep an eye on this place)