There are 10 different groups/artists with this name:
1.) Halloween, an American heavy metal band that formed in 1984. They bill themselves as Detroit's Horror Show. Their carrer spans from 1983 to date. www.halloweentheband.us
2) Italian heavy metal band (1981-1987).
3.) Halloween, a French symphonic prog band. They existed between 1988-2002 and recorded 5 albums.
4.) Halloween, an obscure 70's Disco-Band. They only recorded one album, "Come See What's It All About".

5.) Hallowe'en, a New Zealand noise pop band.
6.) Halloween, sound effects and music designed for Halloween.
7.) Allen Halloween, a Portuguese Rapper.
8.) Short-lived swedish punk band ca 1984, members went on to form Strebers. Would later reform as Hollywood Halloween.
9) The original name of Rockdolls, a glam band from California.
10) "Ethereal glamcore project" from Philadelphia, PA. Released self-titled EP on February 10th, 2023.