i'm trying to figure out how to play keyboard using sheet music.. what i don't understand is that there are F, C, Dm, Dm7, etc above the treble clef notes when there are bass clef notes (left hand?) already written. what do they mean? are they chords? i thought chords are only used for bass clef notes? no? how would i play with the F/A, Csus, etc above the treble clef notes when both clef notes are already written? please forgive my ignorance on this subject.