There are four verses to a cult hymn, each on different music sheets. They are dropped by different members of the Cult.
Be careful! If you "use" the music sheet it will disappear and you will see a message in red: You have learned the first/second/third/fourth part of a hymn. If you already know that verse, you can not use it again, when attempting to do so a message will appear You already know the first/second/third/fourth verse of the hymn.
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You must learn all the verses of the hymn to gain access to the deeper parts of the cultists cave on Vandura (beyond the piano).