The pictorial title of DIA (1979) with its wedge form "refers to the idea of an arrow pointing through the multidimensional musical space of the piece — the beginning of a trajectory crossing through all of it, visiting every point, but a trajectory free of any preordained form or curvature." The grand old man of Finnish Modernism Paavo Heininen (b. 1938) sees form as an idea of time and reflects it in one continuous movement with five distinct sections. DIA was commissioned NOMUS (National Federation of Swedish Orchestral Associations) and premiered by the Finnish Radio Symphony Orchestra conducted by Leif Segerstam in September 1979. The edition of the score at hand is published to celebrate Paavo Heininen's 80th birthday. The edition includes the composer's forward from the year 1979 as well as aspects and memories about DIA written in August 2018.

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Vuonna 1979 NOMUS-tilauksena syntynyt Paavo Heinisen orkesteriteos DIA julkaistaan nyt ensimmäistä kertaa säveltäjän 80. syntymäpäivän kunniaksi. Pienoispartituuri sisältää säveltäjän kirjoittaman esipuheen vuodelta 1979 sekä partituurin editointityön yhteydessä nousseiden näkökulmien pohdintaa vuodelta 2018.