Piano,Vocal,Voice - Level 4 - Digital Download SKU: A0.556908 By Az Yet featuring Peter Cetera. By David Babyface Foster and Peter Cetera. Arranged by PianoSheetNow. 20th Century,Contemporary,Rock. Score. 8 pages. PianoSheetNow #6139969. Published by PianoSheetNow (A0.556908). Hard to Say I'm Sorry is a song written by Peter Cetera and David Foster for the group Chicago. Songwriter Cetera won an ASCAP Pop Music Award for the song in the category, Most Performed Songs.For Piano. Advanced Intermediate.With lyrics. With melody line. With Guitar chords.