The Eurovision 2015 album is still on my play list. Songs were really great then. The other great year was 2016, which was more upbeat.
There have been many years with great songs but 2015 was qualitywise stellar. I disagree with the winner though. Il Volo was the televoting winner with the highest share of available points. Their defeat still outrages me.
My other favourite of 2015 probably is
They would have won easily in any year.
2013 was the first year when I liked at least 5 songs very much. The years before were pretty dire for me.