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I don't know anything about DT or Rhapsody doing any music for videogames but I do know there could really be a future of prog and progmetal with game music. This I believe is because there is definately a correlation between the two types of music, and this is especially true now that game music is using a lot more guitar and orchestrations in their music over the last few years. I have a "gamer" friend who loves game music as well, like me, and he isn't really into other types of music at all. But a lot of the music he hears me listen to of the prog and power metal genre he has told me he likes, and on ocassion we can give examples of what particular games music sounds like the song I am playing. In game soundtracks, especially those of the rpg genre, the composers try to use many different instruments to give the feeling of a different or strange culture, or the mood of what a specific character is like or the situation they are in. Because of this they have to use and expirement with all kinds of diff sounds and insturments. This is the same in prog and prog metal too. I don't think either of them were influenced in general by the other, but that because they are both aiming for the same goal musically, they happen to correlate so closely together.