My music randomly deleted off my iPhone?

So I downloaded a new song and went to my library to see if it downloaded and all my music was deleted. Is there something I can do or do I have to download them all manually? (I tried restarting my phone)

Gggggggggggg

Not to be mean, but how do you expect anyone to be able to help you without stating what type of phone you have and possible the firmware/ios version you are on. I'm going to assume that you are using some sort of android device, in this case if you are saving your music to an micro sd card try double checking to make sure that the phone is still recognizing it. For some reason on my galaxy s3 that I used to have the sd cards would just go bad pretty fast.

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