Itunes 12.6.1 Update Crash Workaround
After looking around for ways to open itunes without it crashing I found a way.
If you go to a song in Finder (right click + open with itunes) it'll open itunes without any crashes and then you can use itunes normally.
For some reason opening itunes with the app button is buggy.
Hope this helped anyone having the same problem.
iMac, OS X 10.9.5