Musica Traits Of Thrash Music...

Thrash metal generally features fast tempos, low-register, complex guitar riffs, high-register guitar solos, double bass drumming, and an aggressive vocal style, ranging from the gruff voices of Metallica's James Hetfield and Tom Araya of Slayer to the signature "snarl" of Dave Mustaine (Megadeth). Occasionally, a thrash metal band will have a more melodic singer. The most prominent example of this is Joey Belladonna of Anthrax, whose style follows a similar vein to that of Bruce Dickinson and Rob Halford.
Most thrash guitar solos are played at high speed, as they are usually characterized by shredding, and use techniques such as sweep picking, legato phrasing, alternate picking, Tremolo picking, string skipping, and two-hand tapping. Thrash lead guitarists are often influenced by the New Wave of British Heavy Metal movement.
Thrash guitar riffs often use chromatic scales and emphasize the tritone and diminished intervals, instead of using conventional single scale based riffing. For example, the main riff of Metallica's "Master of Puppets" is a chromatic descent, followed by a chromatic ascent based on the tritone. Rhythm guitar playing is characterized by extensive palm muting and down picking to give the riffs a chugging sound, along with extensive use of the pedal point technique (creating what can be considered a distinctive, 'thrashy' sound).
Speed, pacing, and time-changes also define thrash metal. Thrash tends to have an accelerating feel which may be due in large part to its aggressive drumming style. For example, thrash drummers often use two bass drums, or a double-bass pedal, in order to create a relentless, driving beat. Cymbal stops/chokes are often used to transition from one riff to another or to precede an acceleration in tempo.
To keep up with the other instruments, many thrash bassists use a pick. However, some prominent thrash metal bassists have used their fingers, such as Frank Bello, Greg Christian, Jack Gibson, Steve DiGiorgio, Robert Trujillo and the late Cliff Burton. Several bassists use a distorted bass tone, an approach popularized by Burton and Motörhead's Lemmy.
Lyrical themes in thrash metal include isolation, alienation, corruption, injustice, addiction, suicide, murder, warfare, and other maladies that afflict the individual and society. Humor and irony can occasionally be found, but they are limited, and are the exception rather than the rule.