"20th Party" marked Matsuda Seiko's first single release on Universal Music Japan, arriving early in her third decade as a recording artist. The track showcases her continued ability to adapt to evolving R&B and dance-pop trends.
- "20th Party" was released on May 17, 2000, by Universal Music LLC.
- The single was Matsuda's first release with Universal Music Japan.
- The song is classified within the pop and R&B genres.
Matsuda Seiko is one of the most commercially successful and influential singers in Japanese music history, known for her prolific output and distinctive vocal style. By 2000, she had long been an icon of Japanese pop, continuing to release music that blended traditional J-pop with contemporary R&B and dance influences.
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