Diatonic (Greek: διατονική) and chromatic (Greek: χρωματική) are terms in music theory that are most often used to characterize scales, and are also applied to intervals, chords, notes, musical styles, and kinds of harmony. They are very often used as a pair, especially when applied to contrasting features of the common practice music of the period 1600–1900.

These terms may mean different things in different contexts. Very often, diatonic refers to musical elements derived from the modes and transpositions of the "white note scale" C–D–E–F–G–A–B (see details below). In some usages it includes all forms of heptatonic scale that are in common use in Western music (the major, and all forms of the minor).Chromatic refers to structures derived from the chromatic scale, which consists of all semitones.

In ancient Greece there were three standard tunings (known by the Latin word genus, plural genera) of a lyre. These three tunings were called diatonic,chromatic, and enharmonic, and the sequences of four notes that they produced were called tetrachords ("four strings"). A diatonic tetrachord comprised, in descending order, two whole tones and a semitone, such as A G F E (roughly). In the chromatic tetrachord the second string of the lyre was lowered from G to G♭, so that the two lower intervals in the tetrachord were semitones, making the pitches A G♭ F E. In the enharmonic tetrachord the tuning had two quarter tone intervals at the bottom: A G F♭ E (where F♭ is F♮ lowered by a quarter tone). For all three tetrachords, only the middle two strings varied in their pitch.

Aldrin Garcia is an American amateur skateboarder who currently holds the World Record on Highest Ollie at 45 inches. It was achieved in Las Vegas, Nevada, USA during that Maloof High Ollie Challenge on 15 February 2011. The record is officially recognized by the Guinness World Record.

Aldrin started skateboarding when he was nine years old when he got a Ninja Turtles skateboard on his birthday.

He is currently sponsored by Powell-Peralta, Bones, Theeve Trucks, Neff headwear, Adio shoes, CMYK, L-R-G, and 9five Eyewear.

John Francis Anthony Pastorius III (December 1, 1951 – September 21, 1987), known as Jaco Pastorius, was an American jazz musician, composer, and electric bass player.

His playing style was noteworthy for containing intricate solos in the higher register and for the "singing" quality he achieved on the fretless bass. His innovations also included the use of harmonics. Pastorius suffered from mental illness including a substance-related disorder, and was diagnosed with bipolar disorder in 1982. He died in 1987 at age 35 following a violent altercation at a Fort Lauderdale bar.

Pastorius was inducted into the Down Beat Jazz Hall of Fame in 1988, one of only six bassists to be so honored (and the only electric bass guitarist). He is one of the most influential electric bass players of all time.

John Francis Pastorius III was born December 1, 1951 in Norristown, Pennsylvania to Jack Pastorius (big band singer and drummer) and Stephanie Katherine Haapala Pastorius, the first of their three children, Jaco Pastorius was of Finnish, German, Swedish and Irish ancestry.

Glenn Herbert Gould (September 25, 1932 – October 4, 1982) was a Canadian pianist who became one of the best-known and most celebrated classical pianists of the 20th century. He was particularly renowned as an interpreter of the keyboard music of Johann Sebastian Bach. His playing was distinguished by remarkable technical proficiency and capacity to articulate the polyphonic texture of Bach’s music.

Gould rejected most of the standard Romantic piano literature and, after his adolescence, avoided Liszt, Schumann, and Chopin. Although his recordings were dominated by Bach, Gould's oeuvre was diverse, including works by Beethoven, Mozart, Haydn, Brahms, pre-Baroque composers such as Jan Sweelinck, and such 20th-century composers as Paul Hindemith and Arnold Schoenberg. Gould was well known for various eccentricities, from his unorthodox musical interpretations and mannerisms at the keyboard to aspects of his lifestyle and personal behavior. He stopped giving concerts at the age of 31 to concentrate on studio recording and other projects.