ITunes deleted half my songs?

Something weird happened yesterday, so I was adding new songs to my iPhone via iTunes (I didn't buy the songs, just saying).It took a few tries to finally get my phone to download them, but when I did, I noticed that I had less songs than usual. So I checked the number of songs, and it said 115.It used to be 241! I checked on my iPhone library via my computer, and it said on the computer that I still had my 241 songs on my iPhone, even though I don't. How do I get them back on my iPhone?

I want to say that I have the same matter with you. I'm so sad, really don't wanna loss my favorite music. I tried so many ways. Finally, i give up.
One day, i find a software named anymp4 iphone transfer. Firstly, i just want to transfer pictures on my computer. Later, i found this amazing software can transfer iTunes files, music, movie, and TV shows between computer and iPhone. Besides, it can supports any other Apple version device. You can have a try, good luck.