An initialism for Star Museum, is a South Korean entertainment company, founded by South Korean music mogul Lee Soo-man. The company operates as a record label, talent agency, travel agency, film production company, music production company, event management and concert production firm as well as a music publishing house. A prominent entertainment company in South Korea, the label is one of the biggest record labels in the K-pop industry. Once the home to the original Korean idol groups like H.O.T., S.E.S., Fly to the Sky and Shinhwa, the label itself is home to a roster of prominent K-pop recording artists that include BoA, TVXQ, Super Junior, Girls' Generation, SHINee, f(x), EXO and Red Velvet where all have achieved domestic and international success. (from Wikipedia)

Red Velvet - KPop Artists
The New State of the Art

While SM's critic's favorite girl group f(x) was mired in controversy and forced to abandon their "Red Light" promotions with their fate in question, the company unveiled a new quirky/cute quartet named Red Velvet.

f(x) the quartet
Inventive and Unique

f(x) is a multinational quartet that makes some of the most interesting pop music coming out of South Korea. Consisting of their Chinese leader Victoria (Qien Song), Chinese-American rapper and vocalist Amber Liu, Korean-American maknae Krystal Jung, and Korean lead singer Luna (Park Sun Young).

Girls' Generation
The Gold Standard

Currently the Gold Standard of Korean Girl Groups, SNSD, as they are commonly known (by the abbreviation of the romanized spelling of the Korean translation of their name), or Soshi (from So-Nyuh Shi-Dae, "era of girls"), are so universally adored in Korea that they have been dubbed South Korea's "National Girl Group" sort of like a national tree or national bird.