The answer’s in the track number.

Singles are 1 track , EPs are 2 – 6 tracks, Albums are 7 – 18 tracks, and Extended (EXTD) albums are 19 tracks or more.

If you are going ahead with premium distribution, each release type has a different initial payment – the annual subscription fees however are exactly the same regardless of the number of tracks within your release. Click here for more information on free and premium distribution.

Check out the full RouteNote Style Guide here!

See also:
How do I merge single tracks into an album?
Which pricing model should I choose?