How to sync songs downloaded from YouTube onto iPhone 4 ios7?

Ever since the ios7 update, I can't sync my music I downloaded from YouTube. I didn't purchase this music from ITunes, as you can't get some songs in there.So, is there a way to get the downloaded music onto my iPhone?

Under the music category in iTunes, highlight all of the songs to be synced, right-click and choose "Add to playlist", select the playlist and choose sync to your iPhone
https://discussions.apple.com/...6#23043886

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