If you have a Newgrounds account, you can follow artists and have a feed custom tailored to your interests!
Step 1: Create an Account
Step 2: Click the FOLLOW button, which appears on user pages and next to artist names in content credits.
Step 3: Click My Feed in the navbar and if any of your favorite artists have posted something new, you'll see it!
Step 4: 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.