How to find and delete of music files on my PC?

For some reason, even though I spent hours organizing all of my music into different files by genre, then different files by artist and then different files by album, (completely and utterly organized) I still have random music files floating about on my PC! When I synced it with my Iphone, I expected just the organized music to be synced, but no, there was tonnes of other songs which I can't find on my computer placed onto my Iphones! I typed in "Kings of Leon" into the 'search programs and files' in the start menu, and found an entire album and more, when this artist did NOT show up when organizing my music files! Wtf!
How can I just check All of my files, including hidden files! It's really frustrating…

Do a search for.mpg files. That should tell you where all your music is at on your computer

"ALISON" " do a search for.mpg files. That should tell you where all your music is at on your computer"

Ok, Alison next time don't write…

"MPG is a file extension for an MPEG animation in the MPEG-1 OR MPEG-2 codec. MPEG-1 was designed for coding progressive video at bit rates of about 1.5 million bits per second. It was designed specifically for Video-CD and CD-i media. MPEG-1 audio layer-3 (MP3) has also evolved from early MPEG work."

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If you wanna find all audio files on you pc type in search field: *.wav ; *.wma ; *mp3 ; *.flac /// One format per search