Name the band

Explanation

The Delfonics are an American R&B/soul vocal group from Philadelphia, Pennsylvania, United States. The Delfonics were most popular in the late 1960s and early 1970s. Their most notable hits include "La-La ", "Didn't I ", "Break Your Promise", "I'm Sorry", and "Ready or Not Here I Come ". Their hit songs were primarily written/composed and produced by lead vocalist and founding member William "Poogie" Hart and the musical instrumentation was arranged/conducted by songwriter and producer Thom Bell.