It may be a solo instrument + piano (Ist row for solo instrument, 2+3 row for Piano)
U need to check where is the melody. Only on the 1st row ? Or appear both in the first row and 2nd row. U may combine the 1st and 2nd row to play.
I think this is modern score, not baroque period, as there is no something such as TRACK at that time.
Scores for Organ will also have 3 rows, but 1st is 高音, 2nd is 低音 and 3rd also 低音 (1st and 2nd use hand, play keyboard, 3rd use foot to play the pedals)