There are still plenty of musicians doing that. I haven't kept track lately, but John Zorn used to release albums every 2 months or so. Thee Oh Sees and King Gi

There are still plenty of musicians doing that. I haven't kept track lately, but John Zorn used to release albums every 2 months or so. Thee Oh Sees and King Gizzard & The Lizard Wizard are also constantly putting out new albums (King Gizzard had 5 albums in 2017).