Blue Steel

Patrick hails originally from Westeros. He started his career primarily as a harpist and sang occasionally, serenading maidens with his sultry low voice. During Robert's Rebellion he actually traveled along with Robert Baratheon writing songs about his triumphs in battle including the Battle of the Trident where Robert defeated Prince Rhaegar Targaryen. Patrick likes to tell people that he aided Robert in defeating Rhaegar, but truthfully he's a bit of a craven and observed the battle behind a large rock.

Seth comes from Tatooine as a friend of Luke Skywalker. Most people don't know that while Luke wasn't busy rebuilding droids, he was a skilled instrument builder. Seth and Luke built many instruments together and even managed to do a short stint at the Mos Eisley Cantina before the current band started their lengthy run. Seth, like Luke, can bullseye womp rats in his T-16 back home.

Joey comes from Middle Earth and was the little known 10th member of the Fellowship (his tenure was brief). Joey was a drummer in the Mines of Moria helping miners rhythmically beat the walls in search of jewels. He happened to be feeling nostalgic at the time the fellowship was passing through and joined them on their journey until they came out on the other side.

The three met at Comic-Con in 2013 when their booths were placed adjacent to one another's and quickly became friends when they realized that I made this entire thing up.