Tremolo Lyrics Follow

In music, tremolo (Italian pronunciation: [ˈtrɛːmolo]), or tremolando ([tremoˈlando]), is a trembling effect. There are two types of tremolo.
The first is a rapid reiteration:
of a single note, particularly used on bowed string instruments, by rapidly moving the bow back and forth; plucked strings such as on a harp, where it is called bisbigliando (Italian pronunciation: [bizbiʎˈʎando]) or "whispering"; and tremolo picking, in which a single note is repeated extremely rapidly with a plectrum (or "pick") on traditionally plucked string instruments such as guitar, mandolin, etc.
between two notes or chords in alternation, an imitation (not to be confused with a trill) of the preceding that is more common on keyboard instruments. Mallet instruments such as the marimba are capable of either method.
a roll on any percussion instrument, whether tuned or untuned.

A second type of tremolo is a variation in amplitude:
as produced on organs by tremulants
using electronic effects in guitar amplifiers and effects pedals which rapidly turn the volume of a signal up and down, creating a "shuddering" effect
an imitation of the same by strings in which pulsations are taken in the same bow direction
a vocal technique involving a wide or slow vibrato, not to be confused with the trillo or "Monteverdi trill"
Some electric guitars use a (misnamed) lever called a "tremolo arm" or "whammy bar" that allows a performer to lower or raise the pitch of a note or chord, which is known as vibrato or "pitch bend". This non-standard use of the term "tremolo" refers to pitch rather than amplitude. True tremolo for an electric guitar, electronic organ, or any electronic signal would normally be produced by a simple amplitude modulation electronic circuit. Electronic tremolo effects were available on many early guitar amplifiers. Tremolo effects pedals are also widely used to achieve this effect.

Source: Wikipedia