N/A

Sometimes this is due to incorrect tagging by Spotify (e.g. this album: Music for Men Og Machines). However, there could be instances where this is a proper name for an artist.
There are several artists with this name.

1. N/A (No Alias) Los Angeles based hip-hop producer.
http://noalias.bandcamp.com
http://twitter.com/#!/noalias

2. N/A - Brooklyn based electro folk duo.
http://na-theduo.bandcamp.com/

3. For starters, All Things in its musical perspective should be most appericiated, dearly we might add.