"The Needle and the Damage Done" is a song by Neil Young that chronicles the descent of musicians he knew into heroin addiction. It was written about the heroin use of his Crazy Horse guitarist Danny Whitten (before Whitten died of an overdose), and previews the theme of "Tonight's the Night", a song that addresses the heroin overdose and death of Bruce Berry, a roadie for Young and his band Crazy Horse.
I caught you knockin' at my cellar door
I love you, baby, can I have some more?
Ooh, ooh, the damage done