"Good-bye days" is a signature ballad by Japanese artist , released in 2006 as the theme song for the film Taiyou no Uta (A Song to the Sun). The track is celebrated for its acoustic-driven melody and bittersweet lyrics, which reflect on the necessity of change while cherishing past kindness. Official Instrumental Access

: Access the high-quality instrumental track from the 2006 single release.

: The official instrumental version is available for free streaming.

The instrumental version of "Good-bye days" is included in the original single and several official digital collections. You can listen to or find the track through the following official platforms: