From Martin Connor, here is a list of seven mechanisms, you can read the explanations at the link:
1. Streamings’ Data Collection Makes Songs Simpler
2. Streaming Sites’ Social Media Makes Songs Confessional
3. Small Streaming Profits Make Songs Shorter
4. Streaming’s Customizability Makes Songs Built To Order
5. Content Digitization Makes Songs More Diverse [TC: does that contradict some of the other general claims?]
6. Free Content Makes Songs More Collaborative [TC: and here’s the explanation for this one:]
Artistic competition is so fierce nowadays that artists need to constantly release music. One way to do this is to make songs shorter and simpler; another way is to get a producer to make the beat, a singer to make the chorus, and another rapper for the second verse. This leads to Migos member Offset, DJ Khaled, Justin Bieber, Chance The Rapper, and Lil Wayne all appearing on the same 2017 song, “I’m The One.” It also means that fans start to see credits like those from Cardi B’s new album “Invasion of Privacy”. The 13 tracks on the album features 104 total writing credits, meaning 8 people per track. Its single “Be Careful” has 17 alone.
7. Video’s Increasing Dominance Makes Songs Into Soundtracks
Via the excellent Samir Varma.