Problem syncing music

I have had an iPhone 6 for about a year. My computer crashed last month and iCloud has not been working. I got all my music back off my hard drive but when put it back on iTunes it has been having lots of problems. It downloaded every song onto my phone, so I had to delete all my music off my phone and start over. Now that i have nothing on my phone i tried to sync my music and only 500 out of 1200 songs that i want will sync onto my phone. A lot of the songs say "waiting" or ineligible and i don't know what that means or how to fix it. Not only that, but even the songs that say "uploaded" won't sync onto my phone. Please help!