New iphone- some of my songs haven't downloaded?

I just upgraded from the 4s to the 5c and completely backed my old phone up to icloud and tried to sync with the new one.

My apps/contacts/messages etc are all fine but some of my songs are missing.

I don't always use iTunes to download songs, so I do have some which are downloaded from other sources.

Is this why I have some missing? Does icloud only back up the ones it recognizes?

It will only back up music purchased on that exact iCloud/Apple ID account. So just go to iTunes and log in and then go into Purchased content to check.

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