Haapamäki studied at the Sibelius Academy in Helsinki with Tapio Nevanlinna and Veli-Matti Puumala. He has also studied with Claus-Steffen Mahnkopf in Leipzig, Germany and with Tristan Murail at Columbia University.
Haapamäki has embraced a quarter-tone based language during the last few years. Some of his most notable compositions written in this style are: "Velinikka" (2008), for quarter-tone accordion and 18 musicians. "Kirjo" (2006), for bass-clarinet and 26 musicians. "Design" (2005), for 16 musicians. "Fresh" (2004, 2007), for 15 musicians. "Maailmamaa" (2010) for mixed choir and tape
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