The terms vibrato and tremolo are sometimes incorrectly used interchangeably, although (in the classical world) they are properly defined as separate effects with vibrato defined as a periodic variation in the pitch (frequency) of a musical note, and tremolo as a fast repetition of the same note (usually a semiquaver) in order to produce the audible ...
The cardinal is easy to spot due to its coloring. It is one of the most popular birds and easily identified by birdwatchers and non-bird-watchers alike. Like the robin, whose plumage also features a distinctive red patch, the cardinal is often associated with Christmas and the winter season.
The Cherokee believe that the cardinal is an omen and is the daughter of the earthly sun. If a person sees a cardinal flying downward then it is bad luck, but if a person sees a cardinal flying upward towards her father, the sun, then it is good luck. The cardinal was recognized in 1926 as the state bird of Kentucky.