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|Availability||February 15, 2010–present|
The dolls make a variety of different noises when squeezed. Each "squeeze" causes the Sing-a-ma-jig to open its mouth to emit noise. The doll's mouth contains a set of plastic teeth that click together when closing. A Sing-a-ma-jig's noises include songs, different notes on the octave scale, and "Hello!" (or "Ahoy there!" in the case of the aqua Sing-a-ma-jig who sings "By the Beautiful Sea"). They each sing a different song unique to their model. The voice that each one has is unique to its model as well. When paired together or in groups, the dolls automatically harmonize with each other.
Sing-a-ma-jigs were popularized by John Green in his video "Making Adorable Music" which was uploaded to YouTube on October 22, 2010. In this video, John models the red, light blue, yellow, and pink Sing-a-ma-jigs by harmonizing them and forming a simple melody. John Green plays four Sing-a-ma-jigs at the same time in this video. He later plays and refers to the Sing-a-ma-jigs in various other videos. Despite being primarily targeted towards young children, Sing-a-ma-jig toys have also become popular with older children as well, being available at retailers specializing in merchandise intended for children above the recommended age group for the dolls.
As of late 2012, there are 21 "basic" Sing-a-ma-jig models: Italicised colors are the ones that have the "Voice Wiggle Effect", although the Aqua and Rose ones were later released as standard versions without that effect. The New Yellow Sing-a-ma-jig is the only one that did not sing the same song in the US and Japanese markets.
|Lime||"John Jacob Jingleheimer Schmidt"|
|Hot Pink||"A-Tisket, A-Tasket"|
|Mint Green||"It's Raining, It's Pouring"||Bass|
|Light Blue||"For He's a Jolly Good Fellow"||Tenor|
|Red 2||"Yankee Doodle"|
|New Yellow (Yellow 2)||"This Little Light of Mine" (US Version) "The Farmer in the Dell" (Japanese Version)||Soprano|
|Frost||"Sing Sing Sing"||Alto|
|Aqua||"By the Beautiful Sea"|
|Rose||"By the Light of the Silvery Moon"||Alto|
|Violet (Purple 3)||"99 Sing-a-ma-jigs (On the Wall)"|
|Dark Purple (Purple 2)||"Clementine"||Alto|
|Lilac||"The Farmer in the Dell"||Soprano|
|Lemon (Yellow 3)||"She'll Be Coming 'Round the Mountain"||Bass|
|Yellow 1||"Home on the Range"||Baritone|
|Red 1||"Where, Oh Where Has My Little Dog Gone?"||Alto|
|Pink||"Skip to My Lou"||Soprano|
|Teal||"When the Saints Go Marching In"||Tenor|
|Orange 1||"On Top of Old Smokey"|
|Tangerine (Orange 2)||"Over the River and through the Woods"|
|Jade Green||"London Bridge Is Falling Down"||Baritone|
In late November 2010, the first holiday-themed Sing-a-ma-jig was introduced for Christmas. "Santa" is a dark green doll with a white beard, and a red-and-white Santa Claus jacket and cap. He sings "Jingle Bells".
The second holiday-themed doll was released in February 2011 in time for Valentine's Day. This doll is red with a pink shirt featuring red hearts. Its ears are unique in that they are also shaped like hearts, breaking away from the bear, dog and rabbit ears used up until now. This doll sings "Let Me Call You Sweetheart".
In March 2011, the third holiday-themed doll was released for Easter. This Sing-a-ma-jig is a white Easter rabbit with more detailed bunny ears. It sings "Here Comes Peter Cottontail", and rather than saying "Goodbye" or "See you later", signs off by saying, "Happy Easter!" His shirt is covered in a colorful Easter Egg pattern.
A 4th of July themed doll was released in time for the holiday in 2011, was Red, White, and Blue, and sang "The Star-Spangled Banner". Instead of "Hello!" or "How do you do?", he signs on by saying "Happy Independence Day!".
Four Halloween themed dolls were released in October 2011. These Sing-a-ma-jigs included a pumpkin, a ghost, a skeleton, and a witch. All of them sing Trick or Treat and the ghost, skeleton and witch were Target exclusives, whereas the pumpkin was not exclusive. For the way they sign off, the pumpkin and ghost sign off by saying "Happy Halloween!", the skeleton says "Scare You Later' and the Witch says "See You Later". Also, for the way they sign on, the pumpkin and ghost say "Trick or Treat" and the skeleton and witch say "Happy Halloween".
There are two Birthday Sing-a-ma-jigs: the pink "Birthday Soprano" and the blue "Birthday Tenor". Each sings "Happy Birthday to You" in different pitches in addition to chattering and harmonizing with other Sing-a-ma-jig characters, and rather than saying "Goodbye" or "See you later", The birthday tenor signs off by saying, "Can I have cake too?" and the birthday soprano signs off by saying, "Bye Bye, Birthday!".
There are 3 Sing-a-ma-jigs of a series called "The Hits!".
|Pink||"Girls Just Want To Have Fun"||Alto|
3 more dolls were released in 2011 as Kohls Exclusives.
|Fairy||"Twinkle Twinkle Little Star"|
|Robot||"Ain't We Got Fun"|
Sing-a-ma-jigs "Duets" consist of one larger character holding another smaller character. With one press of the belly, they simultaneously open their little mouths to sing, harmonize and chatter together.
|Color of Big One||Color of Baby||Song|
|Purple||Pink Baby||"Hello! Ma Baby"|
|Sea Green||Red Puppy||"BINGO"|
|Orange||Pink Teddy Bear||"Clementine"|
|Plum||Sea Green Baby||"When the Saints Go Marching In"|
|Royal Blue||Green Kitten||"For He's a Jolly Good Fellow!"|
|Gold||Green Koala||"Yankee Doodle"|
|Red||Yellow Puppy||"Where Has My Little Dog Gone?"|
|Dark Blue||Yellow Mouse||"On Top of Old Smokey"|
- Townsend, Allie (December 9, 2010). "The Top 10 Everything of 2010 - Sing-a-ma-jigs". TIME. Retrieved 2011-01-06.
- 4th of July Sing A Ma Jig