Comedy Central’s late-night duo is sticking around for at least a few more years. The network announced Wednesday that Jon Stewart has extended his contract to host “The Daily Show” through the middle of 2015. Stephen Colbert also signed an extension that takes him through the end of 2014 as host of “The Colbert Report.” Last week, each show was nominated for four Emmy Awards. Colbert has hosted “The Colbert Report” since 2005. Stewart has presided at “The Daily Show” since 1999. Both are also producers and writers of their shows. … A new compilation of 14 of the Beatles’ most musically, socially or politically influential songs was released this week as a digital iTunes exclusive. The collection, “Tomorrow Never Knows,” nearly spans the group’s entire recording career, from “You Can’t Do That” in 1964 to “I’ve Got a Feeling” from “Let It Be” in 1970. The album also includes “Revolution,” “Paperback Writer,” “And Your Bird Can Sing” and “Hey Bulldog,” among a dozen John Lennon-Paul McCartney compositions, along with a pair of George Harrison’s contributions, “It’s All Too Much” and “Savoy Truffle.” The choice of “Tomorrow Never Knows” as the title will benefit from the high-profile exposure that song from the “Revolver” album recently received with its placement in the hit TV series “Mad Men.” There are no plans for a CD or vinyl release, according to a spokeswoman for EMI and Capitol Records. This may be as close to a 50th anniversary Beatles collection as fans will get. Word from sources close to the Beatles camp indicates that there are no 50th anniversary special projects due before the end of 2012. It was in 1962 that Ringo Starr joined the group, finalizing the lineup that soon would revolutionize the pop music world. The group also released its first recording, “Love Me Do,” on Oct. 5, 1962, in England.