Alright I'm calling it now the unknown stand name is "Here Comes The Sun" by the Beatles
From both the design and song lyrics involving the Sun and the "darling" being comforted from her smiles representing Yasuho, and how the song tells a long time had passed representing the rock humans life span and how tooru hadn't seen Yasuho in a long time.
Plus the bands name "Beatles" as for Jobins obsession