This album marked a significant turning point in Crystal Kay's career, showcasing her evolving sound and cementing her status as a leading voice in Japanese R&B.
- The album was released on August 22, 2001, by Sony Music Labels Inc.
- "637: Always and Forever" features a blend of R&B, soul, and neo-soul influences.
- The album was a commercial success, charting at number 12 on the Oricon weekly albums chart.
Crystal Kay is a Japanese-American singer-songwriter known for her R&B and soul music. She debuted in 1999 and rose to prominence in the early 2000s with a string of popular albums.
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