Some songs sync on my iPod (touch 4th gen)?

I have over 1000 songs and have had no problem syncing up to now - used to synchronize only 2 songs. They have been downloaded via a YouTube mp3 converter, but I do with lots of songs and even downloaded a few songs by this method after these 2 that synchronized correctly. Can anyone help?

Play in iTunes on the computer?

If you right-click on it and select Get Info > file is in the format and other attributes the same as songs that syncs?

Tags: iPod

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