Johnny Cash's wife, June Carter, wrote "Ring Of Fire" about their relationship.
The line, "Gotta keep 'em separated" in "Come Out And Play" by The Offspring came to lead singer Dexter Holland when he was a medical student and needed to keep bacteria samples away from each other.
"Brad Paisley's "River Bank" was inspired by his childhood growing up 500 yards from the Ohio River.
"Lean On" was originally sent by Major Lazer to both Rihanna and Nicki Minaj's camps as a slower reggae track. After both parties rejected the tune, Major Lazer recruited Danish singer MØ to supply vocals and recorded it themselves.
"In-A-Gadda-Da-Vida" was supposed to be titled "In The Garden Of Eden," but someone in the studio wrote down the title phonetically, and it stuck.
R.E.M. got the title "Shiny Happy People" from a Chinese propaganda poster.
Todd Rundgren explains why he avoids "Hello It's Me," and what it was like producing Meat Loaf's Bat Out of Hell album.
Greg talks about writing songs of "universal truth" for King Crimson and ELP, and tells us about his most memorable stage moment (it involves fireworks).
Despite appearances on Carson, Leno and a Pennebaker film, Williams remains a hidden treasure.
The Scorpions and UFO guitarist is also a very prolific songwriter - he explains how he writes with his various groups, and why he was so keen to get out of Germany and into England.
Evelyn McDonnell, editor of the book Women Who Rock, on why the Supremes are just as important as Bob Dylan.
The writer of "Rainy Night in Georgia" and "Polk Salad Annie" explains how he cooks up his Louisiana swamp rock.