[2] His most successful single to date, "No Words", reached the Top 10 of the Global and U.S. Spotify Viral Chart and achieved Gold certification in both Sweden and Denmark.

[5] Aside from solo work, he has cowritten a number of songs for other singers, including Shakira and Rihanna's "Can't Remember to Forget You".

He was introduced to British New Wave at Rytmus, the musical secondary school in Stockholm attended by Robyn and Tove Lo (whom he would later support on her North American tour[12]), where he met his manager at the age of 17.

[4] The Guardian picked up the story, calling him "the Stockholm wunderkind," comparing him to Frankmusik, Keane and Ross Copperman, and wondering if he was "the new, young Robbie Williams.

[21] On 19 January 2010, Hassle appeared at the Danish X Factor finals and the P3 Guld gala,[22] where he was awarded the prize for "Newcomer of the Year 2009".

[26] The mini-album Mariefred Sessions was the result of a collaboration between Erik Hassle and Joakim Berg and Martin Sköld from the Swedish band Kent.

It released worldwide in January 2014 and reached top ten charts in various countries such as Spain, France, Germany, and Switzerland.

[29] Hassle released his next EP, entitled Somebody's Party, via TEN Music Group and RCA Records on 4 March 2014 after a two-year hiatus.

Hassle released "Talk About It," featuring Chicago based rapper Vic Mensa, as his comeback single.

The single was released in April 2015 and received additional publicity when it headed off Taylor Swift's list of "Songs that would Make your Life more Awesome".

[3] It was described as "an uptempo, disco-tinged confection of sighing strings and funk guitar"[31] and hailed as "a return to Hassle's unabashed melodic melancholia.

[33] Hassle co-wrote and provided vocals for the single "Emergency" by fellow label mates and Swedish pop-duo Icona Pop.

[35] Over the years, Hassle collaborated with many artists, including Groundislava on his single "Flatline",[36] Broderick Batts on "¯\_(ツ)_/¯",[37] Kungs on Omi's "Midnight Serenade",[38] Gorgon City on "FTPA",[39] Bondax on "Love Me Blind",[40] and Snakehips on "Cruel".

[5] The LP was executively produced by Daniel Ledinsky and features the guest vocals of Tinashe and Vic Mensa, producers Eshraque "iSHi" Mughal and Dave Sitek, with additional production from SOHN, Oskar "Sikow" Engstroem, Billboard, Gorgon City and Al Shux.