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Kapp graduated from the Conservatory in 1900 as a composer and from 1904 until 1920 worked as a music director in the southern Russian city of Astrakhan, then returning to Estonia as a professor and conductor at the Tallinn Conservatory where he counted among his students such future notable Estonian composers as Evald Aav, Edgar Arro, Gustav Ernesaks, Helen Tobias-Duesberg, Riho Päts and Enn Võrk.