Mr. Moix you totally made my day by pointing me to ELO – Mr. Blue Sky. That song is somewhat in the category “heard it in the radio, liked it, but never further investigated” :)
It’s been a pretty tough day today. First there was the preliminary “Abitur” (kinda like A-level) computer science exam at school today which was pretty exhausting since it took me the full 4,25 hours to complete. Second I had sports lessons after that :-) Third I had a performance at music school today. We have a annual performance which this year happened to be today (right after both “Vorabitur” exams) and I failed performing the song “Fever” by Michael Bublé since I only had like 4 days to learn it by heart (well not really since I had to study for the exams). So THAT was actually not music that made me happy.
However hearing ELO before writing the exam made me happy and lifted my mood.

So to actually answer your question: Here is the music which makes me happy:

This are just some I randomly came up with. There are probably so much more but I’m really interested in what Planet comes up with.