"Suite: Judy Blue Eyes" is a suite of short songs written by Stephen Stills and performed by Crosby, Stills and Nash. It appeared on the group's self-titled debut album in 1969. It was also released as a single (edited and in mono), going to #21 on the Billboard Hot 100 pop singles chart. The song is ranked #426 on Rolling Stone's list of the 500 Greatest Songs of All Time.
The group has performed this song many times, most famously at the Woodstock and Live Aid festivals. The title may be a play on words for "Sweet Judy Blue Eyes"; also, the song may be considered a suite in the classical music sense (i.e., an ordered set of musical pieces, usually four in number).
The acoustic guitar for the song is tuned to a very unusual tuning. Rather than being tuned to the traditional EADGBE, it is tuned to EEEEBE, which is also known as "Bruce Palmer Modal Tuning". Stills used this same tuning for "4+20". He uses a similar tuning for "Carry On" but drops the notes a half step. The fifth string is tuned down to the same note as the sixth string, and the third string is tuned down to the same note as the fourth string.
The title refers to Stephen Stills' former girlfriend, singer/songwriter...