I'm missing tons of music off of my iTunes library

I connected my iphone to my laptop, it synced the phone as usual, and then i noticed that when i went to listen to music on my phone that TONS of songs were missing! I did not delete any of them, i simply plugged my phone into the laptop, and now they're gone.someone help!

You probally didn't sync all the songs on there double check on your itunes and see what songs are missing

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