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The following applies only if you are using iTunes to sync your music:
Unfortunately you can't add art to multiple songs. Some info can be changed this way, but not the artwork, probably for some reason only the program developers know.
Once you have the art in iTunes it is only a matter of syncing your iPad again.
I have the artwork on Itunes on my computer. When I sync to the Ipad, however, the only artwork that comes over to the IPad is that for music that I have purchased from ITunes Store. This problem seems to have come up after the last IPad OS update. Apple support won't talk to me about it unless I pay them.