Good tunes man, those were all very good, was not sure what to expect, but good listening all three. What ties them together? They had better and so did I..... Hmmmmm... This is a tough one.

They are all in their twenties I think, that's one thing that ties them together. They also all have tattoos. I doubt I'm on the right track tbh... I think it's trickier than that and the clue does not point to either..