The actor Dan Aykroyd sang on "We Are The World." LaToya Jackson did too, so we know they weren't all that picky.
The Australian band Jet took their name from the 1973 song of the same by Paul McCartney and Wings.
The line "satellite of love" in the Def Leppard song "Rocket" came from the title of a 1972 Lou Reed song.
Neil Young wrote the CSN&Y song "Ohio" about the Kent State Shootings, when the National Guard opened fire on students at Kent State University in Ohio, killing four.
"Zombie" by The Cranberries is about an IRA bombing in England that killed two children.
The chorus of "Voulez-vous coucher avec moi ce soir" in "Lady Marmalade" is French for "Do you want to sleep with me tonight?" When Labelle performed it on television, they had to change it to "Voulez-vous danser avec moi ce soir" (Do you want to dance with me tonight?).
The Garbage drummer/songwriter produced the Nirvana album Nevermind, and Smashing Pumpkins' Gish and Siamese Dream.
Chad tells tales from his time as drummer for Nirvana, and talks about his group Before Cars.
In the name of song explanation, Al talks about scoring heroin for William Burroughs, and that's not even the most shocking story in this one.
The lead singer/lyricist for Anberlin breaks down "Impossible" and covers some tracks from their 2012 album Vital.
Our chat with Barney Hoskyns, who covers the wild years of Woodstock - the town, not the festival - in his book Small Town Talk.
The singer/bassist for Concrete Blonde talks about how her songs come from clairvoyance, and takes us through the making of their hit "Joey."