Songs Won't Play On iPhone 4s With Update?

I have had my iphone 4s for a little over a year and I just updated to iOs 6. My iphone isn't synced to any computer but it hasn't been a problem before. My problem now is that some of my music either will not play on the music player or it takes a very long time for it to begin to play. I download all my music directly from iTunes on the iphone. It started when I downloaded one song, Skyfall by Adele, about a week ago and the song only plays about 1/2 the time and there's no album artwork with the song. After that download my other songs started taking about 30 seconds to begin to play. I have tried to play Skyfall in almost every way possible. It won't play when you go to iTunes and hit the play button and also in a playlist it just skips over the song to the next one. How do I fix this problem?

Simple solution… Buy another brand

Ipone 4s has these red dots next to songs I've had for ever. They won't play! What gives?

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