GarageBand, iPhoto re-install?
Once you do a reinstallation wipe of a Mac all data, including apps (even Apple ones) are deleted. So, unfortunately it seems like you'll have to buy GarageBand (it came with your Mac the first time, right? You didn't buy it separately, did you?). It sounds like you can redownload iMovie, and iPhoto was replaced by Photos (free from Mac App Store).