Listen to Bound in Thoughtful Solace (Key B Ver.) online. Bound in Thoughtful Solace (Key B Ver.) is an Instrumental language song and is sung by L'appartement. Bound in Thoughtful Solace (Key B Ver.), from the album Optimal BGM For Reading, was released in the year 2025. The duration of the song is 2:33. Download Instrumental songs online from JioSaavn.