John and Paul loved to sing “Baby’s in Black” together, sharing a microphone onstage, but not “Yes It Is,” which came a few months later and got released as the B-side of “Ticket to Ride.” “Baby’s in Black” was one of the many songs they wrote on tour in hotels, eyeball to eyeball, singing into each other’s mouths. Something “Baby’s in Black” and “Yes It Is” have in common: neither one is a boy singing alone. These are harmony ballads, untranslatable to a solo voice. They’re songs about saying no to life, no to the future, yet they don’t begin until the singers say yes to each other. – Rob Sheffield, Dreaming the Beatles
Maybe he didn’t like singing yes it is because it may be about John mourning Stu, meanwhile baby’s in black is Paul saying that he has to forget him
