Charly Lownoise & Mental Theo were a DJ duo from the Netherlands.

They are best known for their successful happy hardcore songs, but have also produced gabber & Eurodance records.

Charly Lownoise was born as Ramon Roelofs on June 16, 1968, in The Hague in South Holland and was later member of Starsplash.

Their more popular tracks include "Wonderfull Days" (which samples Help Get Me Some Help by Tony Ronald), "Stars" and "Live At London".

They played their final show together on July 30, 2022, at the Ziggo Dome in Amsterdam.