Unity of Albany's music page has a handy dandy listing of hundreds of songs appropriate for New Thought services, all linked to mp3's and samples.
Need ideas? Try this page.
Need sheet music for these? Try Musicnotes, which has transposable digital downloads, or of course Empower Music & Arts, if it's a very New Thought-specific songwriter.
And here's a Unity NW region music ministry resource page. We're finding and sharing more and more resource material, so if you've got a good one in your files, please email and let us know!