The Delfonics are a pioneering Philadelphia soul singing group, most popular in the late 1960s and early 1970s. Their most notable hits include "La-La (Means I Love You)", "Didn't I (Blow Your Mind This Time)", "Break Your Promise", "I'm Sorry", and "Ready or Not Here I Come (Can't Hide from Love)". Their hit songs were all written by songwriter and producer Thom Bell and lead vocalist and founder William Hart. - Source: Wikipedia