What's the difference between keyboard and melodeon?

Keyboard

Definition:

(n.) The whole arrangement, or one range, of the keys of an organ, typewriter, etc.

Example Sentences:

(1) The iPad is a 9.7in tablet computer with a virtual keyboard which can surf the web, do email, display ebooks and play video.
(2) A 32 key keyboard offers many advantages for use with the HP PDMS.
(3) Before physically disabled individuals can operate augmentative communication devices, computer keyboards or other assistive or rehabilitative devices, they should be provided with the optimum seated posture from which to operate.
(4) On the whole though, there is not much yelling but much tapping of keyboards.
(5) I was the Specials' founder, main songwriter and keyboard player.
(6) Some plump for Your Love , with its distinctive keyboard figure that subsequently turned up both on Candi Staton and the Source's endlessly reissued and covered 1991 hit You Got The Love and, of all things, psychedelic rock band Animal Collective's My Girls.
(7) Units are selected by the computer to meet requirements specified by the operator of a keyboard terminal.
(8) In total 99 patients, visiting the outpatient clinic of Internal Medicine for the first time, took part in this in-depth study, in which they could express themselves via an interactive and modified terminal and keyboard.
(9) He might not be the hard-drinking rockstar of old but classically-trained pianist James Blake proved that cerebral compositions on a keyboard are no barrier to success after he was crowned winner of the coveted Barclaycard Mercury prize .
(10) You have CEOs of major companies who whip out their BlackBerrys because of the keyboard.
(11) Perhaps his keyboard should have been shaped like a Snapchat of a stranger's todger instead.
(12) Pins (dots) being used to represent written information on a braille keyboard, the device in this application is not used as an input but for output purposes.
(13) Critics have focused on the price, which ranges from £429 to £699, and point out that "netbook" computers with full keyboards are available for about £350.
(14) Keyboard work consists mostly of dynamic contractions of the small muscles of the forearms and hands.
(15) There was sweat in every stroke and that was just on this keyboard.
(16) The interrelationships of these ocular and orthopedic phenomena have been synthesized into a comprehensive hypothesis, in an effort to create a computer configuration which permits a greater integration of the keyboard (tool-usage) with the screen-visualization (product-of-tool-usage), and improves visual feedback.
(17) On the day that Sony Pictures decided to cancel the release of The Interview – a comedy about the fictional assassination of the North Korean leader, Kim Jong-un – the firm’s employees were advised to cover their keyboard with a cloth when logging into email “so that hackers can’t see what you are typing”.
(18) But we stuck with them because we all use them heavily for email and the qwerty keyboard is much faster than a touchscreen, especially for one who has touchtyped at the speed of light since I was 13.
(19) The new keyboard is the jewel in the crown and RIM has mastered the experience.
(20) Keyboard operators had an odds ratio of 3.0 for tension neck syndrome (five studies).