The sung Masses listed are all being sung by the Schola Abelis (they don't have a monopoly on singing at the Traditional Mass, but the two other groups who regularly do so aren't doing anything this quarter as far as I know).
Please support these Masses! And please support the Schola Abelis, which doesn't run on thin air. You can see their Gloria TV videos here.
And please support the Latin Mass Society, without whose encouragment, practical support and in many cases financial sponsorship many of these events would not be taking place. If you are reading this, and are not a member, why not join up? If you are a member, you can give a year's subscription to a friend as a gift.