For the week starting Friday, April 20. Times are E.S.T., subject to change. NBC Spring Concert (Sat. 6:30 p.m., NBC). Haydn’s “Surprise” Symphony. Invitation ...

For the week starting Friday, Dec. 28. Times are E.S.T., subject to change. Metropolitan Opera (Sat. 2 p.m., ABC). Lucia di Lammermoor, with Lily Pons, Ferruccio ...

Seven at Eleven is an American comedy/variety show that aired live on NBC Monday and Wednesday night from 11:00 pm to midnight Eastern time from May 28, 1951 to June 27, 1951 on the nights when ...

Saturday Roundup is an American Western television program that aired on NBC on Saturday night from June 10, 1951 to September 1, 1951 at 8:00 p.m Eastern time .