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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, "jibber-jabber" made up of vowel sounds, different notes on the octave scale, a greeting, and a goodbye. They each sing a different public-domain 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.
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.
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 her alto voice.
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. He has a baritone vocal range.
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!" He has a tenor vocal range.
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!". These were only sold in the UK and Japan, and they all have the Voice Wiggle Effect.
|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.
- Green, John (October 22, 2010). Making Adorable Music. VlogBrothers. YouTube. Retrieved October 26, 2014.