Question: In the ending of which computer game DLC is "Jingle Bell Rock" used?
About the article "Jingle Bell Rock", section "In popular culture".

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"Jingle Bell Rock" is a popular Christmas song first released by Bobby Helms in 1958.
It has received frequent airplay in the United States during every Christmas time since then.
"Jingle Bell Rock" was composed by Joseph Carleton Beal (1900–1967), and James Ross Boothe (1917–1976).
Beal was a Massachusetts-born public relations man and longtime resident of South Ocean Avenue in Atlantic City, New Jersey, and Boothe was a Texan writer in the advertising business. 
 Lite.
On March 10, 2010, "Rock Band Unplugged Lite" was released on the PlayStation Network, which is a downloadable version of the game for $4.99.
The "Lite" version includes the 5 Starter Pack songs, but can accept all DLC.
The in-game Music Store, accessible via Wi-Fi, enables users to download any of the original "Rock Band Unplugged" songs for the same price as the existing downloadable songs.
Original "Rock Band Unplugged" songs can only be purchased through the in-game Music Store, while additional DLC songs can be purchased from either the PlayStation Store or the in-game Music Store. 
"Jingle Bell Rock" has been performed by many, but Helms' version is the most known in the world.
Its title and some of its lyrics are takeoffs on the old Christmas standard, "Jingle Bells."
It makes brief references to other popular songs of the 1950s, such as "Rock Around the Clock," and mentions going to a "Jingle hop."
An electric guitar played by Hank Garland can be heard playing the first notes to the chorus from "Jingle Bells.
"Despite being titled a Jingle Bell "Rock", Helms' version of the song was performed in the crossover style known as rockabilly.
Bobby Helms' original version on Decca 9-30513 from 1957, was re-recorded by him on Kapp K-719 in 1965 and yet again in 1967 on Little Darlin' LD-0038.
In 1970, Helms recorded an entire album titled "Jingle Bell Rock" on Certron C-7013, releasing from the album the title track on Certron C-10021 with a picture sleeve.
In yet another re-recording, Helms released a version on Ashley AS-4200 (year unknown).
In 1983, Bobby Helms released his last recording of "Jingle Bell Rock" on Black Rose 82713. 
Since 1998, the Edge has run an annual concert series in December of each year.
From 1998 to 2008, it was known as the Edge Electric Christmas.
Starting in 2009, it began to be billed as Jingle Bell Rock.
It is a series of several concerts which are generally in smaller concert venues, although playing in large venues is not unheard-of.
A percentage of proceeds from ticket sales are donated to the Daily Bread Food Bank. 
A jingle is a memorable slogan, set to an engaging melody, mainly broadcast on radio and sometimes on television commercials.
Jingle or jingles may also refer to:  Jingle (vehicle), a covered, two-wheeled Irish vehicle  One of several species of mollusk in the family Anomiidae, genus Anomia  Jingles (album), a "Best of" album by Australian band Regurgitator  Jingle (percussion), one of a group of small discs or bells in a percussion instrument  Jingle (protocol), a VoIP extension to the Extensible Messaging and Presence Protocol  Jingle Bells, a popular Christmas song * Jingle bell, a small bell of the type mentioned in the song  Jingle Belle, a cartoon character created by Paul Dini  Jingle County, in Shanxi, China