There's this thing called a Leitmotif. At its simplest, it is an audio cue.
So here's an idea - represent different classes or roles with different instruments, and have various actions or activity levels give rise to longish chords of music. This is more than just a 3 note audio cue which is played every time the priest casts Smite - instead, there would be a multi-bar track of music which is associated with a priest casting lots of offensive spells, with a different multi-bar track for healing spells.
For the tank, as the danger level increases the dramatic tones of his leitmotif could increase. The more adds he's tanking could be represented by a more frantic pace. If the tank's health starts to dip, the music could take on an ominous score. And if the tank dies?
All this is a mile ahead of simple background music on a loop and sound effects tied directly to specific abilities ... so I wouldn't expect to see it in any game anytime soon. Which is a pity.
And no, the wolf is represented by French Horns. It is the grandfather who is represented by the Bassoon.
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