Do Catholics sing protestant hymns

Yes. There is really no difference between Catholic hymns & Protestant hymns. Both Protestants and Catholics are Christians. Catholics have some extra ones that have to do with the Eucharist, Mary, & other Catholic beliefs, but Catholics and Protestants share the majority of hymns. For example, did you know that the popular song "Your Grace is Enough" was originally written by a Catholic? Chris Tomlin, the artist most people think wrote the song, borrowed and adapted parts of the melody of it from Catholic singer Matt Maher. Catholic and Protestant artists and composers borrow songs from each other and share them with the general public both in CD form and in hymnals for church.