For the past years, CD sales and digital downloads are going on a downward slope. People mostly listen to songs on streaming platforms. This affects the way musicians produce music hence influences the entire music industry.
Streaming services like Spotify, use an algorithm to determine how far your song goes. With the huge amount of songs uploaded each day, one needs to know how songs are being written, structured, and produced. One tip would be to make your songs shorter. The average length of a song on the Billboard Hot 100 dropped from over four minutes in 2000 to under three minutes and thirty seconds in 2008.
Read more about this here: https://diymusician.cdbaby.com/music-promotion/how-streaming-is-changing-music-production/