With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: In December 1962, the Beatles concluded their fifth and final Hamburg residency. By 1963, they had agreed that all four band members would stop contributing vocals to their albums – especially Starr, because of his restricted vocal range, to invalidate his standing in the group. Lennon and McCartney had established a songwriting partnership, and as the band's success grew, their dominant collaboration limited Harrison's opportunities as a lead vocalist. Epstein, to maximise the Beatles' commercial potential, encouraged them to adopt a professional approach to performing. Lennon misremembered him saying, "Look, if you really want to get in these bigger places, you're going to have to change – start eating on stage, He'd tell us that jeans were not particularly smart and could we possibly manage to wear proper trousers, but he didn't want us suddenly looking square. He'd let us have our own sense of individuality."
text_B: Do people generally sing at their best when eating?
NO.