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  2. Free-bass system - Wikipedia

    en.wikipedia.org/wiki/Free-bass_system

    Free bass accordion is taught at the undergraduate and post-graduate levels at the National Autonomous University of Mexico in Mexico City. In the United States, free bass instruments are much less well known despite attempts to popularize them by Palmer and Hughes and the Giulietti Accordion Company [ 17 ] [ 18 ] in the 1960s and 1970s.

  3. Stradella bass system - Wikipedia

    en.wikipedia.org/wiki/Stradella_bass_system

    96-button Stradella bass layout on an accordion. C is in the middle of the root note row. The Stradella Bass System (sometimes called [1] standard bass) is a buttonboard layout equipped on the bass side of many accordions, which uses columns of buttons arranged in a circle of fifths; this places the principal major chords of a key (I, IV and V) in three adjacent columns.

  4. Chromatic button accordion - Wikipedia

    en.wikipedia.org/wiki/Chromatic_button_accordion

    Chromatic button accordion; Classification: Free-reed aerophone: Playing range; Right-hand manual: The Russian bayan and chromatic button accordions have a much greater right-hand range in scientific pitch notation than an accordion with a piano keyboard: five octaves plus a minor third (written range = E2-G7, actual range = E1-D9, some have a 32 ft Register on the Treble to go even lower down ...

  5. Bootstrap (front-end framework) - Wikipedia

    en.wikipedia.org/wiki/Bootstrap_(front-end...

    The first alpha version of Bootstrap 4 was released on August 19, 2015. [16] The first beta version was released on August 10, 2017. [17] Otto suspended work on Bootstrap 3 on September 6, 2016, to free up time to work on Bootstrap 4. Bootstrap 4 was finalized on January 18, 2018. [18] Significant changes include: Major rewrite of the code

  6. Accordion in music - Wikipedia

    en.wikipedia.org/wiki/Accordion_in_music

    Opposite the Titano Accordion "quint" free bass system designed by Willard Palmer, Ariondo and the late Tommy Gumina are two artists in the United States that play a reverse "quint" free bass system (no converter, only free bass). Ariondo's "Perpetual Motion" video demonstrates the artistic capabilities of the free bass accordion .

  7. Button accordion - Wikipedia

    en.wikipedia.org/wiki/Button_accordion

    The accordion has free reeds [3] on both the treble and bass sides. In modern accordions, the free reeds are generally made of tempered steel. [3] The press of a button or key opens a valve to allow air to pass through the reed or reeds to make a sound when the bellows are pumped in or out.

  8. Accordion (GUI) - Wikipedia

    en.wikipedia.org/wiki/Accordion_(GUI)

    A common example using a GUI accordion is the Show/Hide operation of a box region, but extended to have multiple sections in a list. SlideVerse is an accordion interface providing access to web content. [1] The list view of Google Reader also features this. In an early example, Apple's download page used roll-over accordions in 2008.

  9. File:Accordion button mechanism.svg - Wikipedia

    en.wikipedia.org/wiki/File:Accordion_button...

    You are free: to share – to copy, distribute and transmit the work; to remix – to adapt the work; Under the following conditions: attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses ...