I've been extremely discouraged lately, today in particular as I was getting my music together to play for Mass tomorrow. I came across Musicae Sacrae today and I decided to sit down and read it since I hadn't read it before. Anyway, I really appreciated this quote from the encyclical:

All who use the art they possess to compose such musical compositions, to teach them or to perform them by singing or using musical instruments, undoubtedly exercise in many ways a true and genuine apostolate. They will receive from Christ the Lord the generous rewards and honors of apostles for the work they have done so faithfully.

Just keep trying your best, everyone, even if it seems like no one appreciates your efforts. What we're doing is so important.