I have to sneak in just one gem penned by Neil Sedaka that got a bit above #50:
"Don't Hide Your Love" - Cher (#46, '72; #50 Cash Box)
"Shoot For the Moon" - Poco (#50, '82)
"Can You Read My Mind" - Maureen McGovern (#52, '79)
"What 'Cha Gonna Do For Me" - Chaka Khan (#53, '81)
"Tough World" - Donnie Iris (#57, '82)
"All Along" - Blessid Union of Souls (#70, '96)
"I'll Get Over You" - Crystal Gayle (#71, '76)
"Back in My Life Again" - Carpenters (#72, '81)
"Stand or Fall" - The Fixx (#76, '82)
"Holiday Road" - Lindsey Buckingham (#82, '83)
"We May Never Love Like This Again" - Maureen McGovern (#83, '75)
"The Hardest Part" - Blondie (#84, '80)
"Don't Want to Say Goodbye" - Raspberries (#86, '72)
"Boats Against the Current" - Eric Carmen (#88, '78)
"Sunrise" - Duran Duran (#89, '04)
"AM Radio" - Everclear (#101, '00)
"You're an Ocean" - Fastball (#101, '00)
"Sing a Happy Song" - O'Jays (#102, '79)
"Go Away" - Gloria Estefan (#103, '93)
"Keep This Heart in Mind" - Bonnie Raitt (#104, '82)
"Dreams" - Grace Slick (#104, '80)
"Jamaica" - Bobby Caldwell (#105, '82)
"Goin' Back to China" - Diesel (#105, '82)
And the total non-charters, at least on US Hot 100:
"Tell Me Why" - Beatles ('63)
"Give a Little Love" - Bay City Rollers ('75)
"Turn to Gold" - David Austin ('84)
"In the Time It Takes" - Beth Nielsen Chapman & Paul Carrack ('93)
"Never Knew Love" - Oleta Adams ('94)
"She Remembered" - Eric Carmen ('99)
"Someone That You Loved Before" - Diana Ross ('99)
"Little Piece of Heaven" - Neville Brothers ('99)