I have read that:
In elementary piano, the left hand (lower notes) typically plays chords, while the right hand plays the melody. If you're playing pop or rock and singing, you might want to play the chords with the right hand and the bass note of each chord with the left hand.
1-So if you play the chords with the right hand, there needs to be someone else to play the melody? i.e. are you actually the bassist of the band in this situation?
2- I have seen sheet musics that have notes in both treble and bass clefs and also chord symbols above the treble clef. Are those only for bands? Cause you can't play a chord when you are using your both hands.