how to order by hasmany-count (without query())

I have tables: users, sounds, votes.
- users hasmany votes
- sounds hasmany votes
- votes has fields: id, user_id, sound_id

This setup gives me the ability to have users vote for sounds, and to
keep the info about who voted for what (though maybe this is not a
good way to do it, if so, please correct me).
I want a query that gives me a list of sounds, ordered by the number
of votes (so the number of occurences of the sound_id in the votes-
table).
How do I make the query?
What I have so far is $this->Sound->find('all',aa('limit',10,'order',a
('Vote.sound_id')));
The part in 'order' is wrong, and I have no idea how to adapt it, can
someone shed some light on this?
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