Swedish DJ Avicii passes away at 28.Musicians including David Guetta, Madonna, Calvin Harris, Charlie Puth, Zedd, Rita Ora, Ryan Tedder, among others took to their social media pages to express grief over the loss. Expressing shock over the news and remembering his dear friend, David Guetta tweeted, "Something really horrible happened. We lost a friend with such a beautiful heart and the world lost an incredibly talented musician. Thank you for your beautiful melodies, the time we shared in the studio, playing together as djs or just enjoying life as friends. RIP @Avicii". Devastating news about Avicii, a beautiful soul, passionate and extremely talented with so much more to do. My heart goes out to his family. God bless you Tim x," wrote Scottish DJ Calvin Harris.