Nielsen have released their mid-year report:
For the rst time in Nielsen Music history, R&B/Hip-Hop has become the largest share of overall volume (Album + TEA + SEA), with 25.1% of the total volume coming from the R&B/Hip-Hop genre. Rock, which had always been the largest genre in the past, slips to second with 23% of the total volume.
R&B/Hip-Hop has become the largest genre by dominating share of streaming consumption. Over 30% of audio on-demand streaming comes from R&B/Hip-Hop, nearly as much as the next two genres combined (Rock 18% and Pop 13%).
If you don’t want to give Nielsen a bunch of personal information, you can read the report here.