@thecarparhian
Need to define obscure. But really there is no contest.
Back in the late 70's there was a local rock band out of Leavenworth KS called The Most Obscure. So any song by them would qualify and win. But they did write a song called The Light of Day which never made it out of their basement. So that song, which never made it past the light of day is the ultimate Most Obscure song.