Its doubtful that folk singer Yusuf Islam, or the artist formerly known as Cat Stevens, expected his return to the musical stage to be met with such derision. He found a cascading wall of boos and fans darting out of the O2 Arena in Dublin. His well known anthems like “Wild World” and “Father and Son” were met with vigorous applause. but Stevens seemed to try his audience patience by presenting an impromptu 40-minute take on his new West End musical Moonshadow slapped into the middle of his set.