One of the delights about the organ is its virtually limitless repertoire, and this Pipedreams program explores some of that as we sample a collection of the latest releases of pipe organ repertoire on compact disc. Hear pieces by Bach’s favorite pupil, a work for organ and cello by written by one Paris Conservatoire professor for himself and a colleague, a canny combination of organ sound with an electronically synthesized harp, a quiet bluesy Arietta by African American pianist Thomas Kerr, and a sonorous symphony by Alexander Guilmant which will make your speakers rumble.