Alicia Keys wrote "If I Ain't Got You" just after she'd heard the news that Aaliyah had passed away. in a plane crash.
"Master Blaster (Jammin')" is Stevie Wonder's tribute to Bob Marley, released less than a year before Marley died.
David Bowie's "Space Oddity" tells the story of an astronaut who cuts off communication and floats into space. The BBC used it extensively in their coverage of the 1969 moon landing - an odd choice considering the lyrics.
"I Can See Clearly Now" by Johnny Nash was the first reggae song to hit #1 in America on the Hot 100.
Rihanna was Pitbull's first choice to sing on "Timber," but she wasn't available at the time so he enlisted his RCA labelmate Kesha instead.
"Tush" doesn't have to refer to anatomy, according to ZZ Top. It's a word that also means "lavish."
Roger tells the stories behind some of his biggest hits, including "Give a Little Bit," "Take the Long Way Home" and "The Logical Song."
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.
Sheryl Crow's longtime songwriting partner/guitarist Jeff Trott reveals the stories behind many of the singer's hits, and what its like to be a producer for Leighton Meester and Max Gomez.
Despite appearances on Carson, Leno and a Pennebaker film, Williams remains a hidden treasure.
Richie talks about the impact of "Amazed," and how his 4-year-old son inspired another Lonestar hit.
The country sweetheart opines about the demands of touring and talks about writing songs with her famous father.