"Supalonely" was the breakout single by New Zealand singer-songwriter BENEE.  While she had success previously with her single, "Soaked", she only started receiving international attention with the release of "Supalonely".  The section of the song used on TikTok is usually from 47 seconds to 1:02, though the original dance (linked below) goes for an extra 10 seconds.  Currently, "Supalonely" has about 10 million videos on TikTok.

TikTok user @zoifishh

TikTok user @charlidamelio

The focus of the TikTok audio for "Supalonely" is its chorus.  The drums play a relatively standard beat with the kick playing on every 1 and 3 of the measure while the snare hits on the 2 and 4.  This ends up feeling and sounding very similar to the drum beat in "Say So", where the kick played on every beat while the snare also hit on the 2 and 4.
The bass in "Supalonely" doesn't have any changes in it that create a contrast with the general rhythm of the drums.  It primarily plays on every 1 and 3, following the kick, while also playing an accent on the fourth 16th note of the 2 and 4.  This accent adds anticipation to the rhythm, predicting the kick.
In both "Savage Love" and "Say So" the guitar primarily acts as a rhythmic element, where in "Mood" the guitar is the main melodic instrument.  The guitar in "Supalonely" does neither of these, acting in a more passive manner playing only on chord changes.  In the chorus that happens every 2 measures, which means the guitar only plays 5 times (7 in longer videos).  There is a keyboard that plays more often, playing at the start of every bar three times in a row and then refraining the fourth time.
The instruments in this section of "Supalonely" take on a background role as compared to the post chorus that follows

Video count from TikTok

Mood analysis from Cyanite

The Cyanite analysis of "Supalonely" looks most similar to those of "Mood" and "Savage Love", which is interesting considering all three of these songs are in different genres; "Supalonely" being alternative or indie, "Mood" being hip-hop/rap, and "Savage Love" being reggaeton.  That being said, as previously mentioned the happy metric is pretty easily associated with "Supalonely" being in a major key.  When listening to the start of the song, the guitar and keyboard are relatively isolated.  The keyboard sound is similar to ones common in lo-fi (low-fidelity) hip-hop: a slightly downsampled keyboard with noticeable static noise, while the guitar has a pitch warble and a chorus effect.  Both of these sounds are relatively mellow sounding timbres, which most likely plays in to the calm and relaxing ratings.  "Supalonely" does garner some points in the energetic and uplifting categories, most likely due to the dance inspired drum beat.
While some parts of "Supalonely", such as the post chorus, seem to be more in line with "Lottery", the most popular sound in this project, the chorus section clearly fits in with other songs like "Savage Love (Laxed - Siren Beat)".
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