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[edit] Accordion and Concertina

Main articles: accordion and concertina

The accordion plays a major part in modern music. Popular players include John Williams, Sharon Shannon and Dave Hennessy. Concertina players include Niall Vallely and Noel Hill.

The accordion spread to Ireland late in the 19th century. In its ten-key form (melodeon), it was popular across the island, and was recorded early by John Kimmel and Irish-American Peter Conlon.

There are numerous ways to play the accordion, including the "push-and-draw" method pioneered by Joe Cooley, and the "outside in" system from the United States, championed by Joe Derrane, Joe Burke Paddy O'Brien (of Tipperary), Kieran O'Loughlin of Clare and James Keane [Dublin and New York]

Concertinas are of several types, the two most common in Irish traditional music being the English and the Anglo systems. Each differs from the other in construction and playing technique. The Anglo is the more common in Irish music and its use in that genre precedes the English. The most distinctive characteristic of the Anglo system is that each button sounds a different note, depending on whether the bellows are compressed or expanded. Anglo concertinas typically have either two or three rows of buttons that sound notes, plus an "air button" located near the right thumb that allows the player to fill or empty the bellows without sounding a note.

Two-row Anglo concertinas usually have 20 buttons that sound notes. Each row of 10 buttons comprises notes within a common key. The two primary rows thus contain the notes of two musical keys, such as C and G. Each row is divided in two with five buttons playing lower-pitched notes of the given key on the left-hand end of the instrument and five buttons playing the higher pitched notes on the right-hand end. The row of buttons in the higher key is closer to the wrist of each hand.

Three-row concertinas add a third row of accidentals (i.e., sharps and flats not included in the keys represented by the two main rows) and redundant notes (i.e., notes that duplicate those in the main keys but are located in the third, outermost row) that enable the instrument to be played in virtually any key. A series of sequential notes can be played in the home-key rows by depressing a button, compressing the bellows, depressing the same button and extending the bellows, moving to the next button and repeating the process, and so on. A consequence of this arrangement is that the player often encounters occasions requiring a change in bellows direction, which produces a clear separation between the sounds of the two adjacent notes. This tends to give the music a more punctuated, bouncy sound that can be especially well suited to hornpipes or jigs.

English concertinas, by contrast, sound the same note for any given button, irrespective of the direction of bellows travel. Thus, any note can be played while the bellows is either expanded or compressed. As a consequence, sequential notes can be played without altering the bellows direction. This allows sequences of notes to be played in a smooth, continuous stream without the interruption of changing bellows direction.

Despite the inherent bounciness of the Anglo and the inherent smoothness of the English concertina systems, skilled players of Irish traditional music can achieve either effect on each type of instrument by adapting the playing style. On the Anglo, for example, the notes on various rows partially overlap and the third row contains additional redundant notes, so that the same note can be sounded with more than one button. Often, whereas one button will sound a given note on bellows compression, an alternative button in a different row will sound the same note on bellows expansion. Thus, by playing across the rows, the player can avoid changes in bellows direction from note to note where the musical objective is a smoother sound. Likewise, the English system accommodates playing styles that counteract its inherent smoothness and continuity between notes. Specifically, when the music calls for it, the player can choose to reverse bellows direction, causing sequential notes to be more distinctly articulated.