an> ?&#8288;sort:<a href="../Mpd/Tags/index.html#type-t">Mpd.Tags.t</a> <span>&#45;&gt;</span> ?&#8288;window:(int<span class="keyword"> * </span>int) <span>&#45;&gt;</span> unit <span>&#45;&gt;</span> (<a href="../Mpd/Song/index.html#type-t">Mpd.Song.t</a> list, <a href="../Mpd/Protocol/index.html#type-ack_error">Mpd.Protocol.ack_error</a><span class="keyword"> * </span>int<span class="keyword"> * </span>string<span class="keyword"> * </span>string) Stdlib.result Lwt.t</code></dt><dd><p>Find songs in the 