Hello
Adele
Event-song of 2015 was "Hello" by the british singer Adele.
She is co-author of the song with Greg Kurstin. But she's most of the two.
The song is a slow ballad with some soul and gospel nuances, that talks about this woman that phone calls this guy that presumably is a her former boyfriend for a long time, after many years.
From the lyrics I get that our beloved Adele commited something big, because it seems like she's talking to someone that doesn't have some much of a willing to talk to her.
This single of Adele was released in 23th of October in 2015 and hit the ears right away, collecting lot of appreciations and covers by all the people.