Regrets, I've had a few. But then again, too few to mention.
The Beatles, David Bowie, Allman Brothers Band, Jimi Hendrix, Led Zeppelin, Pink Floyd, The Clash, The Grateful Dead, The Rolling Stones, Bob Marley and the Wailers, Animal Collective, Wu-Tang Clan, etc...
The Mockingbird Foundation is a non-profit organization founded by Phish fans in 1996 to generate charitable proceeds from the Phish community.
And since we're entirely volunteer – with no office, salaries, or paid staff – administrative costs are less than 2% of revenues! So far, we've distributed over $750,000 to support music education for children – 210 grants in 43 states, with more on the way.