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In musical terminology, tempo ("time" in Italian; plural: tempi) is the speed or pace of a given piece or subsection thereof, how fast or slow.

Tempo is related to meter and is usually measured by beats per minute, with the beats being a division of the measures, though tempo is often indicated by terms which have acquired standard ranges of beats per minute or assumed by convention without indication.

Tempo may be separated from articulation, or articulation may be indicated along with tempo, and tempo contributes to the overall texture.

While the ability to hold a steady tempo is a desirable skill, tempo is changeable, and often indicated by a conductor or drummer.

While practicing, an electronic or mechanical device, a metronome, may indicate the tempo, as one usually works one's way up to being able to perform at the proper tempo.

In other words, it is the speed at which a passage of music is or should be played.

Super Audio CD (SACD) is a read-only optical disc for audio storage, introduced in 1999.

It was developed jointly by Sony and Philips Electronics, and intended to be the successor to their Compact Disc (CD) format.

While the SACD format can offer more channels (e.g. surround sound), and a longer playing time than CD, research published in 2007 found no significant difference in audio quality between SACD and standard CD at ordinary volume levels.

Classical music is art music produced or rooted in the traditions of Western music, including both liturgical (religious) and secular music.

While a more accurate term is also used to refer to the period from 1750 to 1820 (the Classical period), this article is about the broad span of time from roughly the 11th century to the present day, which includes the Classical period and various other periods.

The central norms of this tradition became codified between 1550 and 1900, which is known as the common-practice period.

The major time divisions of Western art music are as follows:

A guitar amplifier (or guitar amp) is an electronic amplifier that strengthens the weak electrical signal from a pickup on an electric guitar, bass guitar, or acoustic guitar so that it can produce sound through one or more loudspeakers, which are typically housed in a wooden cabinet.

A guitar amplifier may be a standalone wood or metal cabinet that contains only the power amplifier (and preamplifier) circuits, requiring the use of a separate speaker cabinet–or it may be a "combo" amplifier, which contains both the amplifier and one or more speakers in a wooden cabinet.

There is a wide range of sizes and power ratings for guitar amplifiers, from small, lightweight "practice amplifiers" with a single 8" speaker to heavy combo amps with four 10" speakers and a powerful amplifier, which are loud enough to use in a nightclub or bar performance.

Blu-ray or Blu-ray Disc (BD) is a digital optical disc data storage format.

It was designed to supersede the DVD format, in that it is capable of storing high-definition (720p and 1080p) and ultra high-definition video resolution (2160p).

The plastic disc is 120 mm in diameter and 1.2 mm thick, the same size as DVDs and CDs.

Conventional (pre-BD-XL) Blu-ray Disc discs contain 25 GB per layer, with dual layer discs (50 GB) being the industry standard for feature-length video discs.

Triple-layer discs (100 GB) and quadruple layers (128 GB) are available for BD-XL re-writer drives.

The name "Blu-ray" refers to the blue laser (specifically, a violet laser) used to read the disc, which allows information to be stored at a greater density than is possible with the longer-wavelength red laser used for DVDs.

The main application of Blu-ray is as a medium for video material such as feature films and physical distribution of video games for the PlayStation 3, PlayStation 4, and Xbox One.

Besides the hardware specifications, Blu-ray is associated with a set of multimedia formats.