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.
Unlike migratory birds, red cardinals do not go away for winter. Instead, they stay to sing songs during frosty cold winter days, painting the scenery with their beautiful feathers. They represent the warmth, the life and energy. A cardinal may symbolize the fire of life that burns within our souls, even in the darkest and coldest times.