There's not much information about this, as I was looking for obscure songs. Enjoy.
Also, source = https://www.reddit.com/r/AlarmoffTeto/comments/1qn0mc0/all_the_headcanons_for_teto_ive_drawn/

[Metadata]
SKELETON LIFE
Unknown ft. Kasane Teto
nm6508711

YT Upload date: March 22, 2009
https://www.youtube.com/watch?v=0sRfRu0NEm0