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.
The introduction of the electric bass in jazz fusion, as in the rock world, helped bassists play in high-volume stadium concerts with powerful amplifiers, because it is easier to amplify the electric bass than the double bass (the latter is prone to feedback in high-volume settings). The electric bass has both an accompaniment and a soloing role in jazz. In accompaniment, the bassist may perform walking basslines for traditional tunes and jazz standards, playing smooth quarter note lines that imitate the double bass. It is called a walking bass line because of the way it rises and falls using scale notes and passing notes.
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.
When you hear a person humming music, what is it that you hear? Commonly, it's the bass line. Something about those low, rhythmic notes really have a big impact, with some of the best examples being "Seven Nation Army" by the White Stripes and "Under Pressure" by Queen. There are countless others you could surely name, but the bottom line is that the bass guitar is a crucial part of modern music and definitely an instrument to be proud of. Fortunately, with dozens of bass guitars for sale here, you're sure to find one that strikes the right chord with you.