The tone or key would be D.
The keyboard serves the accompaniment for the three violins. It is recurring chords of D A b f# G D G and A. You can download the arrangement for solo keyboard for free at sheet music sites such as IMSLP or Free-Scores.
Pachelbel's Or Canon in D, by Pachelbel.
Look up "Canon in D major for violins" in a serach engine.
C is the leading tone in the Key of D.
Pachelbel's Canon (Canon in D Major by Johann Pachelbel)
There are reasonably good keyboard versions of the Canon in D.
The keyboard serves the accompaniment for the three violins. It is recurring chords of D A b f# G D G and A. You can download the arrangement for solo keyboard for free at sheet music sites such as IMSLP or Free-Scores.
Pachelbel's Or Canon in D, by Pachelbel.
That is was composed by Johann Pachelbel and is called the Canon in D.
A semi tone that raises the melody.
C is the leading tone in the Key of D.
Look up "Canon in D major for violins" in a serach engine.
Pachelbel's Canon (Canon in D Major by Johann Pachelbel)
Canon in D is Pachelbel's most famous composition. It was composed in early 1600's. It is paired with a gigue in the same key.
Some popular keyboard songs are Chopsticks, Fur Elise, and Nachtmusik. Other common classics are Greensleeves and Pachelbel's Canon.
Canon in D
Some musical bands that incorporated the melody of Pachelbel's Canon in D in their songs include "The Pop Tops" and "Aphrodite's Child." You can learn more about Pachelbel's Canon in D at the Wikipedia.