In the early 1940s, many jazz musicians, especially African American jazz musicians, started to stray from the popular big band dance music of the 1930s. Their experimentation and quest for deeper expression and freedom on the instrument led to the birth of a new style of music based from Harlem called bebop music. Whereas swing was a popular music designed for dancing, bebop was a "musician's music" designed for listening. During the bebop era, given that bands no longer had to accompany dancers, bandleaders could speed up the tempo. Bebop was also much more based on improvisation, in comparison to the heavily arranged big band scores. Bebop musicians would take an old standard and re-write the melody, add more complex chord changes, resulting in a new composition.
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Multi-scale fingerboard is an alternative design for guitars and bass guitars in which the lower-pitched strings gain more length and the higher-pitched strings get shorter, similar to the string lengths on a grand piano. The reason for the uneven scale length across strings is that it evens out the tension across all of the strings, it evens the timbre across the strings, and extending the lower string scales allows the string to produce harmonics that are more in tune with the fundamental.
The bare minimum requirements for a budget digital piano are to have 88 keys (the same number found on traditional acoustic pianos) and internal speakers to facilitate practicing without an amplifier. Beyond that, some amount of weighted key action (either semi-weighted or hammer action, more on this in a moment) and an accurate piano sound were the primary deciding factors for our picks. An included stand and sustain pedal were not requirements, as aftermarket options are readily available and inexpensive. (We discuss some options below.)
Microphones ("mics") are used with drums to pick up the sound of the drums and cymbals for a sound recording and/or to pick up the sound of the drum kit so that it can be amplified through a PA system or sound reinforcement system. While most drummers use microphones and amplification in live shows in the 2010s, so that the sound engineer can adjust and balance the levels of the drums and cymbals, some bands that play in quieter genres of music and that play in small venues such as coffeehouses play acoustically, without mics or PA amplification. Small jazz groups such as jazz quartets or organ trios that are playing in a small bar will often just use acoustic drums. Of course if the same small jazz groups play on the mainstage of a big jazz festival, the drums will be mic'ed so that they can be adjusted in the sound system mix. A middle-ground approach is used by some bands that play in small venues; they do not mic every drum and cymbal, but rather mic only the instruments that the sound engineer wants to be able to control in the mix, such as the bass drum and the snare.