Composers and lyricists rub off on one another, pointing each other in new directions and influencing each other's styles. What can we learn from these relationships -- and who, ultimately, deserves the credit for a successful musical theater song?

SONGS FEATURED:

"They're Playing My Song (Hers)" from They're Playing Our Song

"My Eyes Are Fully Open" from Ruddigore

"Fascinating Rhythm" from Lady, Be Good!

"Embraceable You" from Girl Crazy

"Manhattan" from The Garrick Gaieties

"To Keep My Love Alive" from A Connecticut Yankee

"My Favorite Things" from The Sound of Music

"Not Since Nineveh" from Kismet

"Les tringles des sistres tintaient" from Carmen

"Beat Out Dat Rhythm on a Drum" from Carme ...