ITunes deleted all my songs, how do I get them back?

I was receiving error codes and went to Apple’s website for help, I was reading methods to rid the error codes and it ended up deleting my songs (about 1000). Is there any way in getting them back?

I already went into iTunes, right clicked on my iPhone (under devices) and selected “restore from backup”, it went under the regular restoration process, restarted my iPhone and did not receive any changes, any help would be greatly appreciated.