If you have a Newgrounds account, you can follow artists and have a feed custom tailored to your interests!
Step 1: Create an Account
Click the FOLLOW button, which appears on user pages and next to artist names in content credits.
Click My Feed
in the navbar and if any of your favorite artists have posted something new, you'll see it!
Make note of the menu on the left, where you can drill down to individual categories such as only showing new music by artists you follow.