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5.
quite simply, it's a "portable keyboard". It's a small portable synthesizer (with keys of course) that has a handle similar to that of a guitar. The neck is usually kind of thick but still can be gripped by one hand. It may sport switches and buttons to alter the sounds being played. Keytars are convienient.
Jan Hammer of "Miami Vice" and Mahavishnu Orchestra fame glued a handle on his Probe keyboard for ease of walking around on stage while playing. This may be an example of an early keytar, but it wasn't called by that word yet.

Keytars first got notoriety in the 80s but are certainly not restricted to that decade by any means. Notable keytar players include Howard Jones AKA "Hojo", Jean Michel Jarre, the members of the Moog Cookbook and more. Hit videos by artists as diverse as Don Henley, Michael Jackson, Herbie Hancock, Janet Jackson , John Parr and even Shania Twain have featured backing musicians playing keytars.
by Video Killed The Radio Star September 01, 2009
 
1.
The absolute coolest way to play the piano. First comes piano, then electric synth, than keytar. 6-year olds complaining about not liking piano lessons: Don't worry you'll be grateful in the future.
My Korg RK-100 keytar is off the hook and all because of the piano lessons I took from the ages of 5 to 13.
by Ozone August 07, 2004
 
2.
The sweetest instrument of all time! Imagine a keyboard, but combine it with a guitar. Now plug it in, and BAM it sounds like a keyboard!
Holy sweet Jesus! A keytar player! Boy, I wish I was as sexy as that player is!
by Sultan of Swing March 13, 2005
 
3.
A keyboard that is designed to be played standing up, like a guitar.
Hey, man that's an awesome keytar you got there!
by basmo October 21, 2003
 
4.
A portable instrument comprised of keys with controllers for the left hand that lets the user emulate pitch bending and vibrato. One of the earliest recorded uses of the term "Keytar" was in 1980 by Jeffrey Abbott aka KeytarJeff ( source "The Times of London" August 18 2007). The Instrument now is made custom and in limited production(Zen Riffer).
Sound like a guitarist on a "Keytar!
by Keytard0 April 10, 2008
 
6.
the gayest instrument every to be thought of by humans aliens and gods alike. it disgraces the guitar and the piano with one stone.
Alex: Tim look at that dude he is totally fucking awesome he is playing a keytar.
Tim:you suck(sounds of tim beating up alex until he is nearly dead)
by not in the 80's September 14, 2008