As walk in the Shadows said, some 'tonal similarity' in some elements of his voice. I confess i actually bought a Manilow album , just before i got into rock music - our wee Northern Irish town had no real music shops - just the local electrical outlet. So among the kettles and radios and lights there was a tiny cassette and record section, with basically zero choice - country & western, local stuff, and a few pop discs. Still good times, aprt from that live B Manilow album.