What genre of music  did Loudest Whisper debut on a vinyl record format characterized by a speed of 33 ⁄ rpm, a 12 or 10 inch (30 or 25 cm) diameter, and use of the "microgroove" groove specification?
The Children of Lir (Loudest Whisper album) The Children of Lir is the debut album by Irish folk rock/progressive folk group Loudest Whisper. It is the studio adaption of the musical of the same name that was performed in Fermoy, Ireland in 1973. The album was released on LP record in Ireland by Polydor Records in 1974 in a limited edition of 500 copies.
Pitch control A variable speed pitch control (or vari-speed) is a control on an audio device such as a turntable, tape recorder, or CD player that allows the operator to deviate from a standard speed (such as 33⅓, 45 or even 78 rpm on a turntable). The latter term "vari-speed" is more commonly used for tape decks, particularly in the UK. Analog pitch controls vary the voltage being used by the playback device; digital controls use digital signal processing to change the playback speed or pitch. A typical DJ deck allows the pitch to be increased or reduced by up to 8%, which is achieved by increasing or reducing the speed at which the platter rotates.