You know, considering how Shadowrun magic works, it's a wonder I haven't seen this floating around before. Heck, I'm surprised there aren't magical girls, wannabe Z fighters, mystical ninjas, mystic adepts based on fighting games, Cthulhu Mythos mages, why the psionic tradition gets tossed by the wayside when there's a huge contingent of people here and now who think that's how magic works, and people who summon watcher or task spirits that look like RTS minions. Optimus Prime would be the best mentor spirit ever. Who'd'you figure that is, Wise Warrior?
Talisman or action geas for playing a guitar would be awesome and amazing. Take Dark King and wander the continent in the quest to form the world's most awesome band.