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According to research conducted at the University of Frankfurt, singing boosts the immune system. The study included testing profesional choir members’ blood before and after an hour-long rehearsal singing Mozart’s “Requiem”. The researchers noticed that in most cases, the amount of proteins in the immune system that function as antibodies, known as Immunoglobulin A, were significantly higher immediately after the rehearsal. The same increases were not observed after the choir members passively listened to music.