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.
Cardinal is the name as well as the color worn by Cardinals, the highest priests in the Roman Catholic Church. Red is worn on the day of Pentecost as a sign to celebrate the birth of the Christian Church as well as on Christmas to celebrate the birth of Jesus. Red is symbolic of steadfast faith.