The move by consumers away from owning music to renting it from services like Spotify and Apple Music has caught fire. Streaming is now the U.S. recorded-music industry’s biggest revenue source, surpassing downloads and CDs at the end of 2015, according to the Recording Industry Association of America. As of June 30, 36% of music sales reported to Nielsen are from streaming, up from 20% last year and far bigger than the 26% from physical albums and 20% from digital downloads.