They'll be singing at my parish, Our Lady of Lourdes on 63rd and Haverford on Sunday, February 22nd. two of my friends at the parish who are also altar servers are on this choir, so I'll be sure to go.
They'll be singing at the 12:15 pm mass. From what I know, the mass setting will be one of Pietro Yon's, so I'm excited. (I've never heard any of his works sung liturgically.)
If you want a taste of their sound, here's a not-very-good recording of them singing Mozart's Laudate Dominum. Here's another of them practicing Pueri concinite.
I like them, and I can see the above mentioned friends in the second video.