Who has had a profound musical impact?
For me, I'd say Ace Frehley of Kiss had the most musical impact on me. This is due to the 20 years of hatred he inspired when I accidently stepped on my brother's copy of Ace's solo album from when all 4 members of Kiss all released solo albums.
And after I stepped on it and broke it, and I swear on Cthulhu's holy tentacle it was a f***ing accident, my brother never forgave me. Or at least he didn't until I gave him the CD of Ace's solo album. Which netted me partial forgiveness, and a snide comment that the vinyl I broke would be worth more.