Dubstep

Dubstep is a genre of electronic dance music that originated in South London, England. It emerged in the late 1990s as a development within a lineage of related styles such as 2-step garage, broken beat, drum and bass, jungle, dub and reggae.
Tempo of dubstep average between 138 bpm to 142 bpm, slower than the drum and bass. Many dubstep wear bassdrop, when the bass suddenly high his tone changed from high to low, so supposing like fall.

Wobble bass

One characteristic of certain strands of dubstep is the wobble bass, often referred to as the "wub", where an extended bass note is manipulated rhythmically. This style of bass is typically produced by using a low-frequency oscillator to manipulate certain parameters of a synthesiser such as volume, distortion or filter cutoff. The resulting sound is a timbre that is punctuated by rhythmic variations in volume, filter cutoff, or distortion. This style of bass is a driving factor in some variations of dubstep, particularly at the more club-friendly end of the spectrum.

Many early dubstep tracks incorporate one or more "bass drops", a characteristic inherited from drum and bass. Typically, the percussion will pause, often reducing the track to silence, and then resume with more intensity, accompanied by a dominant subbass (often passing portamento through an entire octave or more, as in the audio example). It is very common for the bass to drop at or very close to 55 seconds into the song, because 55 seconds is just over 32 measures at the common tempo of 140 bpm. However, this (or the existence of a bass drop in general) is by no means a completely rigid characteristic, rather a trope; a large portion of seminal tunes from producers like Kode9 and Horsepower Productions have more experimental song structures which do not rely on a drop for a dynamic peak – and in some instances do not feature a bass drop at all.

Skrillex, Famous Dubstep Musicians
Sonny John Moore (born January 15, 1988), better known by his stage name Skrillex, is an electronic dance music producer, DJ, and singer-songwriter. Growing up in Northeast Los Angeles and in Northern California, Sonny Moore joined the American post-hardcore band From First to Last as the lead singer in 2004, and recorded two studio albums with the band (Dear Diary, My Teen Angst Has a Body Count, 2004, and Heroine, 2006) before leaving to pursue a solo career in 2007. He began his first tour as a solo artist in late 2007. After recruiting a new band lineup, Moore joined the Alternative Press Tour to support bands such as All Time Low and The Rocket Summer, and appeared on the cover of Alternative Press' annual "100 Bands You Need to Know" issue.