- It appears that the music was not in the iTunes library of the computer on which the update was performed. The backup that iTunes makes at the beginning of the update (and sync) process does not includ music and some other items since thos are synced to the iPod latter in the update process.
- When you started the update iTunes shuld have given you a warning that there were iTunes purchases that were not on the computer.
- The purchased music buton only appears in countries where iCloud has been released. It appears that it is not released yet in Denmark.
- You need to contact iTunes and explain what happend and request a redownload. They do not have to give a rdownload since when y purchase music it says you only get one download and it is up to you to backup the music. See this article for contacting iTunes.
You are not addressing Apple in this forum. We are all users like yurself.