So you'd have the song act as a magical capacitor? For as long as Doug plays the song, he accumulates additional mana. When the next song kicks in, the stored mana winds up affecting it as if Doug were pumping it up from a ley line. Of course, if the enhanced song is longer than the meta song, it'll eventually run out of steam and revert to normal functioning.
This would be a very nice song if Doug has time to prepare himself. It would be pretty useless in the heat of battle unless Doug gets in way over his head and is willing to forego any power songs at all while charging up for a big finishing move. It would also be a poor choice to preceed an attempt at using a new song, as it could possibly make a backfire more severe.
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV
This would be a very nice song if Doug has time to prepare himself. It would be pretty useless in the heat of battle unless Doug gets in way over his head and is willing to forego any power songs at all while charging up for a big finishing move. It would also be a poor choice to preceed an attempt at using a new song, as it could possibly make a backfire more severe.
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"Anyone can be a winner if their definition of victory is flexible enough." - The DM of the Rings XXXV