[iTunes] "converting music"...

[Becca]

When I opened iTunes this morning, all of a sudden it started to do a bunch of automatic things such as searching for covers. One of the things it's doing is "converting music" - but I can't figure out from what to what. What's it doing, and why is it doing this? 

-becca

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"There is no greater hatred in the world than the hatred of ignorance for knowledge."
 -Galileo