The AMS (www.ams-net.org) is using this as a bulletin board for:

calls for papers ("CFP")
conference announcements ("CONF")
job vacancy notices ("JOB")
fellowships ("FWP")

It is replicated twice: Google Groups and [no advertising] Bowdoin College. See www.ams-net.org/announce.php for guidelines and full details re the announcement list, for instructions on making posts, and so on.

Musicology-announce has no discussion. If you're looking for musicology discussion, the AMS also sponsors the list AMS-L@indiana.edu. See www.ams-net.org/ams-l/ .