Chord and nonchord tones are defined by their membership (or lack of membership) in a chord: "The pitches which make up a chord are called "chord-tones": any other pitches are called "non-chord-tones"." They are also defined by the time at which they sound: ""Nonharmonic tones" are pitches that sound along with a chord but are not chord pitches." For example, if an excerpt from a piece of music implies or uses a C-major chord, then the notes C, E and G are members of that chord, while any other note played at that time (e.g., notes such as F) is a nonchord tone. Such tones are most obvious in homophonic music but occur at least as frequently in contrapuntal music.