The second part of the yearlong project to celebrate the 20th anniversary of Yiruma's music career. Opposite to the bigger-sized orchestral and string arrangements of the first release (The Rewritten Memories), Solo as shown in the title contains simple piano solo arrangements that have always been loved by his fans. Revisiting Yiruma's repertoires from his earliest days of making music, the songs include "Spring Waltz," "Joy," "Kiss the Rain," and "River Flows in You."