Last Thursday morning, on my way past the Russian cathedral, I thought I heard singing. This surprised me, for it was not yet 7:10. I paused to be sure I heard the choir, then checked the bulletin board beside the parish hall. It was "Procession of the Holy Wood of the Life-Giving Cross of the Lord. Holy Maccabean Martyrs." The liturgy had begun at 6:40. This Tuesday morning, the choir was back for The Feast of the the Transfiguration, and next week they will turn out early for "Dormition of the Most-Holy Theotokos", what Latins call the Feast of the Assumption.
I am impressed at their devotion. It is not difficult to find a 7 am Roman Catholic Mass, and I think that St. Stephen Martyr in Foggy Bottom even has a 6:30 Mass on weekdays. But if you want a Catholic choir before 10 o'clock, you might have to find a convent or monastery.