Some songs from iPhone won't backup to computer?

I bought about 20 songs or so off iTunes from my phone and then I was backing them up and syncing my phone to my computer. When my phone finished, I noticed some of the songs were on my itunes on my computer, but not all of them. I tried again but nothing. What's going on? Why won't some songs back up to my computer?

You probably didn't let all of them back up. You should know that iCloud has limited space. It is possible that you used up all your space.

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