Music in the cafeteria during lunch periods has been provided for students at their request. Maybe the music is hard to hear; the cafeteria was not built to be a concert hall. Maybe the songs aren't all new; the noise of some of them could hardly compete with that made by some students.

Does this make the intent of the music any different? Expressing a simple "thank you" to those responsible for obtaining permission for the playing of the music should be sufficient.