"Altar" is a song by That Poppy (who now goes by the name Poppy). The song is featured on her debut extended play, Bubblebath and was released on February 12th, 2016. The song's audio was released onto her official VEVO channel on February 15th, 2016, along with the audio for "American Kids".
The song is about Poppy's obsession with a person that she loves, and wanting to run away with them. She sings about the girl that they're about to marry being a manipulator. Poppy demonstrates strong emotional ambitions towards the subject of the song, which is unusual because she shows little emotion in her YouTube videos.
Little individual reviews followed the release of Altar, as the track was mostly overshadowed by the previous two Bubblebath hits Money and Lowlife. However, Tyler Peterson of UQMUSIC stated in a review that Money and Altar in particular were "retro-bangers".
- Along with American Kids, it is one of two songs on Bubblebath EP to not have an official music video.
- The song's second verse features a brief reggae beat similar to that heard in Lowlife.
- It is speculated that this song refers to Titanic Sinclair's previous project, Mars Argo. The lines "I know that she has a gun, it's an emotional one" could be referencing her controversial video, "Everybody Wants It All".