Born on this day in 1947, legendary singer-songwriter, musician, and producer, best known as a founding member of Styx and the band's lead vocalist and keyboardist from 1972 until June 1999, Dennis DeYoung turns 77. Dennis DeYoung has been credited as the writer of more Styx songs than any other Styx member. He was also the band's most successful writer, penning 7 of the band's 8 Billboard top 10 singles as well as a solo top 10 single.
In his honor, watch Dennis describing how he knows when he's written a hit song, like "Lady" or "Come Sail Away" (above).