My songs are missing in the music and the used memory doesn't change. Is it a bug for IOS7? How can I fix it?

I plugged my ipod touch 5 via usb to the pc and browsed my music on itunes. And suddenly i played some music and there's a exclamation point before the song. I haven't deleted that song or moved. And the whole album was gone. And i checked the number of songs on my ipod and it decreased without change in memory used. Is it an another BUG for ios7? is there a way to fix it?

That indicates the song files are not corrupted.
Connect the iPod to your computer and look at the storage used by the various categories as shown in the colored bargarph in iTunes.
Come back with the results.
What is the Other on my iPhone and How to Remove It
An large "other" usually indicates that the "other" includes corrupted files.
First try:
"First you go settings/general/usage/music/then left swipe over music and press delete and you would think it deletes your music but it doesn't instead it deletes your other but make sure your ipod is connected to a computer while doing this"
as recommended by:
How do I get rid of "other" storage: Apple Support Communities
Next, usually restoring from backup eliminated the corrupted files. However, sometimes restoring to factory settings/new iPod is required.
To restore from backup see:
iOS: How to back up
To restore to factory settings/new iPod see:
iTunes: Restoring iOS software

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