When searching:
look under audio, not all types
add .wma to the keywordfilter in options
Search only for either artist- or songname, not both at the same time
press the size column so that the largest files are on top and smallest at the bottom
go for higher bitrate 160 192 or higher if possible
Don't get taken by many hosts sharing one file. It does not mean it is better than any of the others

hope this helps

what is bad about the wma extension?

This thread has info on wma/wmv files: What you should know about WMA Files

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