A lay pastor colleague of mine called my attention to hymnpod.com, a free source of traditional hymn accompaniments online. Christopher Tan, a pianist from Singapore, has recorded many, many tunes using an electronic piano, and they are exceptionally clear and singable, and they are lovely to listen to.
The tunes are all in the public domain. Here is a sample, the Swedish tune to which we sing the hymn “How Great Thou Art.”
You can download these tunes to your computer by right clicking on the play button and then select “save audio as.” On iTunes you can download a number of them for free and also subscribe to podcasts of more tunes as Christopher Tan makes them available. Then you can make audio CDs to use in worship, or you can sync them to your iPod and play them back through a compatible player.
For more music resources, see this post reviewing CDs for worship use, and this post about smallchurchmusic.com, a site that offers free downloads of hymn accompaniments in multiple formats. You can also click the resources tab above and scroll down to the music section for more help.