Mark is unquestionably the most prolific composer for the medium, and the Geodesium name has become synonymous with planetarium music. Since 1975, he has recorded and produced soundtracks for more than 50 planetarium shows, with presentations at more than 900 planetaria in the U. S. and 50 other countries. Mark has also performed live in concerts at major planetarium facilities in the U.S. and Great Britain. Geodesium albums are popular items in planetarium gift shops.
Mark uses electronic keyboards, samplers and synthesizers to create his unique brand of planetarium space music. From verdant planetscapes to flights of fantasy through deep space, the music portrays magnificent visions of the universe. Relaxing yet provocative, Geodesium stylings embody "traditional" space music — that ethereal, beautifully floating music that characterizes the genre — as well as more dynamic and rhythmic sonic odysseys that transcend their "new age" and e-music heritage. Mark infuses all his music with rich textures that are the signature of the Geodesium sound.
Mark C. Petersen has been creating space music using the nom-de-plume Geodesium for many years. He got his start at the University of Colorado when he was a music student and gained access to the School of Music's Moog Series III instrument. He began with transcriptions of Bach and Pachelbel, learning his craft and adding to his keyboard studio collection as he went. His planetarium space music career began at the University's Fiske Planetarium, and has grown over the years to include music and soundtracks for more than 60 planetarium shows, dozens of podcasts for 365 Days of Astronomy and the Astronomical Society of the Pacific, video presentations for MIT's Haystack Observatory, plus a number of other multimedia presentations. Outside of the planetarium and science outreach world, Mark's music has been used for selected commercial soundtracks.
At the urging of many pleased planetarium patrons, Mark began releasing his music on commercial albums, beginning with the eponymous album GEODESIUM. Today, he has 12 albums available and more are planned. The music on ten of the albums encompasses a style that has often been described as atmospheric and immersive, taking listeners on aural journeys throughout the cosmos. So far, the only two exceptions are his 2010 Music from SpacePark360 and the follow-up album Music From Infinity, which are wild rides through musical genres as diverse as acid, house, techno, trance, electronica, rock, and yes, some space music.
When not composing Geodesium music for soundtracks, Mark spends much of his time in video production and distribution of fulldome shows to theaters around the world. Mark is also an accomplished tuba player, and throughout his career has performed with community bands and brass quintets.