What is the musical which has "The Rain in Spain" based on?
Pygmalion
Title: The Rain in Spain
Passage: "The Rain in Spain" is a song from the musical "My Fair Lady", with music by Frederick Loewe and lyrics by Alan Jay Lerner.  The song was published in 1956 very similar to piano trio in C minor 3rd movement by Josep Suk.
Title: My Fair Lady
Passage: My Fair Lady is a musical based on George Bernard Shaw's "Pygmalion", with book and lyrics by Alan Jay Lerner and music by Frederick Loewe.  The story concerns Eliza Doolittle, a Cockney flower girl who takes speech lessons from professor Henry Higgins, a phoneticist, so that she may pass as a lady.  The original Broadway, London and film versions all starred Rex Harrison.
Title: Harvest Rain
Passage: Harvest Rain is the musical project of Jason Thompkins.  Born and raised in South Carolina, Thompkins attempts to capture a spiritual dimension of the South in Harvest Rain's music.  It has been labeled as neofolk music.  Members include Axel Frank of the German neofolk group Werkraum and also Jamey Thompkins, Jason's younger brother.  American painter and musician Tor Lundvall has contributed artwork to two Harvest Rain releases, and also collaborated on the track 'Night Chorus' released on the album of the same name.  Matt Howden also plays guest violin for the first two tracks of their demo "A Frost Comes with the Wind."
My Fair Lady The Rain in Spain