A pick (or plectrum) produces a more pronounced attack, for speed, or personal preference. Bass with a pick is primarily associated with rock and punk rock, but player in other styles also use them. Jazz bassist Steve Swallow often plays with a pick, while Pink Floyd bassist Roger Waters uses one for a heavier tone. Mike Gordon of Phish uses a pick while also incorporating slapping techniques into his playing. Picks can be used with alternating downstrokes and upstrokes, or with all downstrokes for a more consistent attack. The pick is usually held with the index and thumb, with the up-and-down plucking motion supplied by the wrist.
Macaque monkeys drum objects in a rhythmic way to show social dominance and this has been shown to be processed in a similar way in their brains to vocalizations suggesting an evolutionary origin to drumming as part of social communication. Other primates make drumming sounds by chest beating or hand clapping, and rodents such as kangaroo rats also make similar sounds using their paws on the ground.
A trigger pad could contain up to four independent sensors, each of them capable of sending information describing the timing and dynamic intensity of a stroke to the drum module/brain. A circular drum pad may have only one sensor for triggering, but a 2016-era cymbal-shaped rubber pad/cymbal will often contain two; one for the body and one for the bell at the centre of the cymbal, and perhaps a cymbal choke trigger, to allow drummers to produce this effect.
While the electric guitar is mostly played with a pick, the bass or jazz bass can be played with either a pick or your fingers. Because of the sensitivity of the pickup on the bass, the two tend to produce somewhat different tones. For example, finger style play can create additional sound from the impact of the strings against the frets, while playing with a pick offers a sharper, more staccato sound. Neither style is better than the other, and there are many famous examples of players using each one. Sometimes, there are conventions of play for a particular genre, but more often it comes down to how a bassist originally learned to play.
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.