Schlaug found that his stroke victims who were aphasic, could not form sentences of three- or four-word sentences, but they could still sing the lyrics to a song, whether it was "Happy Birthday To You"
Schlaug a constatat că pacienţii cu AVC care erau afazici nu puteau alcătui propoziţii de două-trei cuvinte, dar totuşi puteau cânta versurile unei melodii, fie că era „Mulţi ani trăiască!"