Melvin Steals doesn’t remember if he called “heads” or “tails.” All he knows is that the coin flipped in his favor, sparking a series of events that would lead to a timeless song.

That song — The Spinners’ “Could It Be I’m Falling in Love” — landed on the Billboard charts 40 years ago last weekend, beginning a climb that would lead beyond gold-certified status to nearly 4 million radio spins.

That’s meant sizable royalty payments for the two men who wrote the song, Aliquippa-raised twins Melvin and Mervin Steals.