Head canon

•  Bach is slowly building his own Siren Cove family. He doesn't know how a proper family works, but he sure likes to surround himself with nice people who don't look at him to only see a cash cow. Right now Grant is a brother-figure, Riley is a big sister, just like Corinne and Iris is the little one Too Precious For This World I Need To Save You
• Because he's always been the wünderkind/cash cow, he's very unfamiliar with rejection and will handle it inadequately
• His father is a bad guy. Of course Bach doesn't know that, but the man might be connected to Louise's Joey and the people that brought Emily here (MIGHT) 
• He can't cook. At all. 
• He can't read notes, learning songs and musical pieces by ear
• He doesn't really trust people who are interested in him outside his music or looks, because those are his only sells (as his mother used to tell him)
• Basically Bach is mentally still a teen