You'll have to do these steps to get them if thats the case;;
1) Click "Store" at the very top of your iTunes
2) Click "Check For Purchases"
3) I have to put in my password when I do this and if you have to, type your password and click "Check"
4) At the top of your iTunes you should get a "Checking for purchases" loading bar
If you have unfinished downloading songs they with start downloading again
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