TSS (formerly known as The Sunday Sadness) is a dynamic French modern metal band known for their innovative blend of emo, metalcore, alternative rock, synthwave, and more recently, phonk and neo-metal influences. The band was founded in 2016 by Kirby, who sought to combine his emo and metalcore roots into a fresh new sound. The band quickly solidified its lineup with John on guitar and Hugo on Drums.

In September 2024, having signed a deal with Fearless Records, TSS is set to release “KILLING ME,” a single that combines neo-metal, 2000s rock, and metalcore, alongside a visually striking video inspired by 2000s horror films and The Matrix.