First place is easy. JS Bach.
So second place is empty.

From there, you mean now or lifetime? Mozart would be next if we integrated over the past nearly 40 years. He'd be lower now since, knowing the music so well ( crack my skull and you will hear PC 21 leak out) I listen only occasionally. So my answer will lifetime. More or less this order, after Mozart.
Stravinsky.
Schubert.
Beethoven.
Palestrina.
Josquin.
Brahms.
Bruckner.
Schutz. Or maybe Glass or Nyman.
Edited to fix typing oversight of Brahms
The most
important in having changed my life and my musical listening are Tchaikovsky and Glass. Each has been for a while 1 or 2. I confess that for a brief period of madness Mahler was in top spot, but I'd better say no more on that topic

In terms of this past few months Haydn makes top 3, but long term not.