Title: Yakkity Yak
Content:  Yakkity Yak is a Flash animated television series produced by the Vancouver-based animation studio Studio B Productions. It was created by Mark Gravas and aired on Teletoon in Canada and on Nickelodeon in Australia from November 9, 2002 to December 12, 2003. The story centers around an anthropomorphic yak named Yakkity who aspires to become a famous comedian and his friends, Keo (an anthropomorphic pineapple) and Lemony (a young human girl). The copyright to the show is owned by WildBrain, which bought Studio B Productions in 2007.
Title: Yak Bak
Content:  Yak Bak was a line of handheld electronic voice recorder toys developed by Ralph Osterhout at Team Machina for '''Yes! Gear''' (a.k.a. Yes! Entertainment) in the mid-to-late 1990s. Several versions of the toy were developed which include the Yak Bak, Yak Bak 2, Yak Bak WarpR, Yak Wakky, Yak Bak SFX, and the Yak Bakwards. Some of these models also came in pen form as part of the "Power Penz" series. The Yak Bak was intended to be a compact, more affordable competitor to the Talkboy introduced by Tiger Electronics in 1993.
Title: Yak Bak
Content:  Retail priced at $19.99, the Yak Bakwards was essentially the Yak Bak WarpR with an additional "Yalp" button. This button literally reversed the "Play" function, causing the recording to be reversed.
Title: Yakkity Yak
Content:  Yakkity Yak debuted on Teletoon in Canada on January 4, 2003, with the last episode airing on January 28, 2004. It also aired on BBC Kids. In the UK it aired on CBBC. In Australia, it aired on Nickelodeon and Network 10, and would later air on ABC, ABC1, and ABC3. In the United States, it briefly aired on Nickelodeon, from November 9, 2003 to September 4, 2004. It was later run on the Nicktoons channel starting from May 22, 2004 until September 23, 2007. The show also aired on Nickelodeon in Latin America and Europe.
Title: Yak Bak
Content:  In December 1994, YES! launched its YES! Gear product line with the introduction of Yak Bak, a simple device consisting of a single speaker and two buttons. One button was marked "Say" and the other, "Play." By holding down the "Say" button, a person could record six seconds of sound, during which a light would shine to indicate that the Yak Bak was recording. Afterwards, the "Play" button would enable the person to hear what was just recorded. This was the basic premise for all subsequent models of the toy, each one adding a slight variance to the original. The television commercial for it showed a boy sitting in a living room recliner while his sister came by and started fussing at him. Then he kept playing his "Is not!" quote using the Yak Bak at his sister, while his sister kept saying "Is too!". Following encouraging sales of its 1995 line of miniature recorders, YES! introduced four new Yak Bak products for 1996 and lowered the products' prices to a more affordable range. The original Yak Bak would be re-released in 1997 as Yak Bak Classic and again in 2000 as Yak Bak 2k.
Title: Yakkun Sakurazuka
Content:  Yasuo Saitō (斎藤 恭央), also known by the stage name Yakkun Sakurazuka (桜塚 やっくん), was a Japanese comedian, singer, and voice actor.
Title: Yak: The Giant King
Content: Santisuk Promsiri ; Kreadtisuk Udomnak ; Boribroon Junrieng ; Weranut Tippayamontol ; Pawanrat Naksuriya ; Caninap Sirisawut ; Udom Tarpanich ; Bawriboon Chanreuang ; Santisuk Promsiri ; Udom Taephanit ; Kerttisak Udomnak ; Chris Wegoda 
Title: Yak Bak
Content:  The Yak Wakky allowed users to change the pitch and speed of the recording by way of light sensitive sensors on the body of the device. When activated by a switch on the right hand side of the toy, the sensors would, depending on how much light shone on them, increase the pitch of the recording. By using the palm of his/her hand, the user could alter the pitch of the recordings dramatically.
Title: Yakkity Yak
Content:  anthropomorphic pineapple who is actually a human with a pineapple for a head. He is very intelligent but is camera shy and has stage fright. He has rivalries with his father who is only a pineapple, but deep down, he loves him. ; Granny Yak (Pam Hyatt): Yak's grandmother. While she is a good sounding board in a parental way, she also has some of Yakkity's impulsive genes. ; Lemony (Andrea Libman): A blond-haired human girl who has a vivid imagination. ; Reginald Highpants (Ian James Corlett): The town's leading vendor of candy and all things with sugar. He also runs many small businesses. ; Trilo (Jason Schombing): Yakkity's trilobite agent and former circus performer who owns his own Entertainment 
Title: Yak Ballz
Content:  Bobbito Garcia put Yak's demo, "Flossin'," on his CM Famalam show on 89.9-FM WKCR in New York. He later invited Yak to appear on the show in 1998. After a few impressive appearances on WKCR, and "Flossin'" gaining regular rotation, Bobbito approached Yak about some new original music. Yak's lyrics caught the attention of Cage, who was impressed enough to reach out to him; making him an original member of The Weathermen. Soon after, Yak released his first 12-inch, Homepiss in 2000, courtesy of Bobbito and his Fondle’em label. His 4-song EP was released featuring "Flossin'," "The Plague," "Nasty or Nice," and "Homepiss."

Question: who wrote yakkity yak don't talk back?
Answer: Jerry Leiber and Mike Stoller.
Jerry Leiber.
Mike Stoller.