Mammatus is an American psychedelic rock band that has been bending minds and crafting expansive soundscapes since the early 2000s. Known for their heavy, sometimes meditative approach to stoner rock and progressive influences, they have carved a distinctive place in the modern psych scene. The band, hailing from Santa Cruz, California, derives its name from the mammatus cloud formation, which is as complex and intriguing as the band's multi-layered sounds. Throughout their career, they've built a reputation for intense, riff-laden jams that hoist listeners into otherworldly adventures.

Since their self-titled debut "Mammatus" in 2006, the band has consistently pushed the boundaries of their genre. Releases such as "The Coast Explodes" (2007) and "Sparkling Waters" (2015) showcase the band's evolution, diving deeper into uncharted musical territories with each record. The band's latest works, "Expanding Majesty" (which appears to be a significant release duplicated in the list provided), further exemplify their commitment to crafting hypnotic melodies that transport their audience to a state of cosmic ascension. Mammatus's expansive sonic palette and relentless pursuit of the ethereal make them a standout act within the psychedelic music community.