I find some of David Kristian's music positive. "Cumberform" on Music From The Mermaid Room is a good example, if you like Boards of Canada etc. His ambient music is much darker though.
I also quite like Casino vs Japan, King of Woolworth and Ulrich Schnauss.
I guess this is more melodic than "positive" IDM, but if it makes you happy...
Anne :)
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