Several times he was guest of the Ensemble Surplus and contributed to the premiere and live CD production (NEOS) of Mathias Spahlinger's "Colors of Dawn (Farben der Frühe)" for seven pianos. His recording of "Songs without Words (Lieder ohne Worte)" by Paul Ben-Haim together with Julia Rebekka Adler was also published through NEOS. His concerts have been broadcasted by Deutschlandradio, Bayerischer Rundfunk, Norddeutscher Rundfunk, Südwestrundfunk, Radio Bremen, and Hessisches Radio.
Axel Gremmelspacher studied at conservatories in Freiburg, Boston, and Hanover with Robert Levin, Raymond Santisi, James Avery, David Wilde, as well as with John Perry in Toronto as a Fellow of the Rotary Foundation and the Canadian government. He holds an Artist Diploma (Toronto, 2001) and a soloist exam with honors (Freiburg, 2003). As a duo with Julia Rebekka Adler, he was a fellow of the German Music Competition and a member of the national selection for "Concerts for Young Artists" of the German Music Council. Tomislav Nedelkovic-Baynov and Axel Gremmelspacher started playing as a duo during their lectures at the Musikhochschule Trossingen. They gave their duo debut in 2009 in Stuttgart. Their repertoire includes mainly works from the late 19th and 20th Century. In winter 2010/11 he was appointed professor of piano at the University of Music and Performing Arts in Frankfurt.