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  2. Mystic chord - Wikipedia

    en.wikipedia.org/wiki/Mystic_chord

    6–34. In music, the mystic chord or Prometheus chord is a six-note synthetic chord and its associated scale, or pitch collection; which loosely serves as the harmonic and melodic basis for some of the later pieces by Russian composer Alexander Scriabin. Scriabin, however, did not use the chord directly but rather derived material from its ...

  3. Sleep Safe and Warm - Wikipedia

    en.wikipedia.org/wiki/Sleep_Safe_and_Warm

    "Sleep Safe and Warm", also known as "Lullaby from Rosemary's Baby", is a musical composition by Krzysztof Komeda, written for Roman Polanski's 1968 psychological horror film Rosemary's Baby. [2] In the original version, vocals were performed by Mia Farrow , who also played the lead role in the movie.

  4. Piano key frequencies - Wikipedia

    en.wikipedia.org/wiki/Piano_key_frequencies

    Piano key frequencies. This is a list of the fundamental frequencies in hertz (cycles per second) of the keys of a modern 88-key standard or 108-key extended piano in twelve-tone equal temperament, with the 49th key, the fifth A (called A 4 ), tuned to 440 Hz (referred to as A440 ). [ 1][ 2] Every octave is made of twelve steps called semitones.

  5. Key (music) - Wikipedia

    en.wikipedia.org/wiki/Key_(music)

    Key (music) In music theory, the key of a piece is the group of pitches, or scale, that forms the basis of a musical composition in Western classical music, art music, and pop music . Tonality (from "Tonic") or key: Music which uses the notes of a particular scale is said to be "in the key of" that scale or in the tonality of that scale. [ 1]

  6. Music and sleep - Wikipedia

    en.wikipedia.org/wiki/Music_and_sleep

    For adults with sleep-related disorders, music serves as a useful intervention in reducing stress. Approximately 25% of the population facing sleep difficulties regularly use music as a tool for relaxation. [ 2] This process can be either self-prescribed or under the guidance of a music therapist. Music therapy is introduced into the medical ...

  7. How to sleep on a plane: Doctors and travel experts share ...

    www.aol.com/lifestyle/sleep-plane-doctors-travel...

    Here are her tried-and-true tips after 25 years as a professional traveler: Avoid caffeine: Brown recommends turning down the in-flight coffee service so that the caffeine doesn't keep you up ...

  8. Chord substitution - Wikipedia

    en.wikipedia.org/wiki/Chord_substitution

    F–C7–F, F–F ♯ 7–F, B–F ♯ 7–B, then B–C7–B. In music theory, chord substitution is the technique of using a chord in place of another in a progression of chords, or a chord progression. Much of the European classical repertoire and the vast majority of blues, jazz and rock music songs are based on chord progressions.

  9. List of musical symbols - Wikipedia

    en.wikipedia.org/wiki/List_of_musical_symbols

    Musical symbols are marks and symbols in musical notation that indicate various aspects of how a piece of music is to be performed. There are symbols to communicate information about many musical elements, including pitch, duration, dynamics, or articulation of musical notes; tempo, metre, form (e.g., whether sections are repeated), and details about specific playing techniques (e.g., which ...