The Swing Out Sisters are a Japanese pop and jazz group formed in 1985. Here are some key points about them:

1. Members: The group consists of three members - Kei Uno, Michiko Asakawa, and Megumi Mishima.

2. Hit songs: Some of their popular songs include "Since You've Been Gone," "Twilight Zone," and "As Long As You Love Me."

3. Style: They blend elements of jazz, pop, and electronic music in their sound.

4. International success: While primarily popular in Japan, they've also gained some recognition in other countries, particularly in Europe.

5. Longevity: The group has been active for over 35 years, making them one of the longer-lasting acts in the J-pop scene.

6. Albums: They've released numerous albums throughout their career, including both studio and compilation albums.

7. Collaborations: The Swing Out Sisters have worked with various international artists and producers over the years.

8. Influence: They've influenced many later J-pop and jazz fusion acts in Japan and beyond.

The Swing Out Sisters are known for their sophisticated sound and visuals, contributing significantly to the development of the jazz-pop genre in Japan.