I'm assuming that, if I can learn about myself by examining my dreams, then the songs I sing regularly in the shower could be self-revelatory too.
Here are the three songs, any one of which, far more often than not in the morning, I'm singing in the shower:
"Mean to Me" (Frank Sinatra, Columbia Records, 1947)
"Oh, Darling" (The Beatles, Abbey Road, 1969)
"Shoulder Holster" (Elton John, Blue Moves, 1976)
A sonic Rorschach test, to be sure (to mix my metaphorical psychoanalytsts).