First prize winner at Georgia Tech Guthman Musical Instrument Competition in 2014 and People’s Choice Award winner in 2021, Tolgahan Çoğulu, designed his "Adjustable Microtonal Guitar" in 2008. He designed the “Lego Microtonal Guitar” in 2020 with his son Atlas Çoğulu and Ruşen Can Acet and “Automatic Microtonal Guitar” in 2021 with Selçuk Keser. His microtonal guitar has taken him to many festivals and universities in 36 countries including Singapore, USA, Mexico, China, Malaysia, Australia. Tolgahan is building a repertoire for microtonal guitar with more than 40 composers involved at this point. He recently performed at WOMEX’21 Showcase in Porto, Royal Festival Hall in London, 71st Granada Festival in Spain, Leibnitz Jazz Festival in Austria and Amsterdam Muziekgebouw. At the moment, he is doing a research for one year at Conservatorio Superior de Musica in Cordoba until September 2024.