Madonna? Try singing "You're an Angel", Am, four beats, Bm, four beats, and Cmaj7, eight beats, steady four four on bass.
The melody builds up from low notes, very deceptive.
I think Madonna did this song all by herself, just to prove she was a musician, the production is so basic.
After that, she also always used a guitar for one song onstage, tired of the non-musician criticism.
oh baby, you're an angel, walking down the street, looking who to meet, oh, you're an angel, in disquise, I can see it in your eyes.