I've always wondered, where does Liam get his sounds from? Does he scour through freesound, or create them himself, or something other? I'm just curious, and it may end up helping me if I ever revisit music making.
The music is almost entirely done with instruments from East West Composer Cloud. I don't think they are considered the best, but you do get a lot for your money. Sound effects in the game make liberal use of freesound - you can see all the samples in the game credits.