Wow! Just stumbled across this large repository of hymn and song material, Hymns Without Words, which has free downloadable mp3s of traditional hymn accompaniments (in various styles), and samples of newer tunes, which are useful if you don’t know them. Although it’s titled “Without Words”, there are actually a lot of texts on the site as well. Both hymn titles and tunes can be searched (see the top right of the page). Some of these would be very helpful if you are short of a musician.