With SM Entertainment's increase in outsourcing musical materials, production team LDN Noise has garnered more and more fans through K-pop.

Comprised of producer-songwriters Greg Bonnick and DJ Hayde C, LDN Noise recently celebrated their collaborative efforts with girl group f(x) on the album "4 Walls." In addition to producing their eponymous comeback single, the team also has credits on two other album tracks.

"LDN Noise, Tay Jasper and Adrian [McKinnon] killing the game," tweeted the official Warner/Chappell Music Twitter account, the American label that LDN Noise signed with this past March. "Great job."

In addition to "4 Walls," LDN Noise also produced several other lead singles for SM Entertainment groups like Red Velvet ("Dumb Dumb") and SHINee ("View").

After sweeping Chinese and Korean music charts, their collaboration has apparently paid off, as f(x) has earned their first ever solo concert seven years after their debut. Reportedly, the concert will be held at Olympic Park in Seoul in January of 2016.

f(x)'s recent comeback is also the first without former member Choi "Sulli" Jinri, who ceased promotional activities with the group last summer.

"After negotiating with Sulli, who is currently taking a break, about her future activities, we have decided to respect her wishes, and she'll be leaving f(x) and focusing on her acting," read a statement from SM Entertainment according to allkpop.

Allegedly, Sulli's sudden distancing from the group last year began when her relationship with rapper Choiza came under public scrutiny.

"The two were of good senior-junior relationship at first but started to develop interest in each other, and are now seeing each other with good feelings," said Choiza's record label Amoeba Culture last year. "We thank everyone who loves Choiza, and please give the two your love and support."