IOS 8.4: Music Not Transferring onto iPhone? - 1

I recently downloaded IOS 8.4 on my Apple iMac Air and Apple iPhone 5. I previously had 1500 songs on iTunes and on my iPhone. When I downloaded the update the songs on my iPhone were deleted but the songs on my iMac were still there. So I just wanted to add them back onto my iPhone. I might add that these songs haven't been bought off the iTunes store but have been downloaded off Youtube to MP3. When I added them back all the songs were not on my iPhone but the playlists were there. I went onto my iMac and it said that Apple Music doesn't support them. I need them to go back onto my iPhone anyone know how I can do it?

Well, here is how it works…
- You make a backup of important stuff. Several ways to do that…
- Use Time Machine. It's on the Dock, sticking out like a sore thumb.
- Use drag & drop in a Finder window.
- If anything goes wrong, you use the backup to recover missing stuff.

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