There's good news and there's bad news in this article from Billboard. Music streaming has increased overall recording industry revenue, while revenue from sales of digital songs and physical CDs continues to decline. The statistics are comparing the first half of 2015 to the first half of 2016.
Another bit of good news is that the amount paid to artists per stream increased about 20% during that time period. That seems hard to believe so I wonder if musicians who are actually streaming their work have actually seen that increase.
Some more good news for labels and artists: per-stream rates for streaming services are rising. When we take RIAA’s half-year revenue numbers for on-demand streams with Nielsen Music’s on-demand streaming count (which saw total audio and video streams grow to 208.86 billion, up significantly from 2015’s half-year total of 131.61 billion streams), the average blended, per-stream, on-demand rate (whether the stream is audio or video, or on an ad-supported or paid subscription service) has risen to $0.005786 per stream in the first half of 2016, up from from $0.004838 in the first half of 2015. (Note: This doesn’t include publishing royalties.)