Key

In Music theory, the key is the tonal center of a piece. It is designated by
a note name (the tonic), such as C, and can be either in major or minor
mode. What a key designates to a performer is the scale in which all the
diatonic notes of the piece lie. This is slightly more complicated in a
minor key, because the pitch of the sixth and seventh scale degrees in a
minor key can change depending on their harmonic context. The primary key of
a piece of music is indicated at the beginning of the piece with a key signature.

A piece may change key at some point. This is sometimes done by just
starting in the new key with no preparation - this kind of key change is
common in various kinds of popular music, when a sudden change to a key a
whole tone higher is a quite frequently heard device at the end of a song.
In classical music, however, a "smoother" kind of key change is more usual -
this kind of key change is called modulation.

Certain musical instruments are sometimes said to play in a certain key, or
have their music written in a certain key. Instruments which do not play in
the key of C are known as transposing instruments. The most common kind of
clarinet, for example, is said to play in the key of B flat. This means that
a scale written in C major in sheet music will actually sound as a B flat
major scale when played; that is, notes sound a whole tone lower than
written. Likewise, the French horn, normally in the key of F, plays notes a
major fifth lower than written.

Similarly, some instruments may be said to be built in a certain key. A
brass instrument built in, say, B flat, will play a fundamental note of B
flat, and will be able to play notes in the harmonic series starting on B
flat without using valves, fingerholes, slides or otherwise altering the
length of the vibrating column of air. An instrument built in a certain key
will often, but not always, have its music written in the same key (see
trombone for an exception).

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