The Amazon basin is bounded by the Guiana Highlands to the north and the Brazilian Highlands to the south. The Amazon River, which rises in the Andes Mountains at the west of the basin, is usually considered to be the second longest river in the world. However, a team of Brazilian scientists claim that the Amazon is the longest river in the world.
Singing is the act of producing musical sounds with the voice, and augments regular speech by the use of sustained tonality, rhythm, and a variety of vocal techniques. A person who sings is called a singer or vocalist. Singers perform music (arias, recitatives, songs, etc.) that can be sung with or without accompaniment by musical instruments. Singing is often done in an ensemble of musicians, such as a choir of singers or a band of instrumentalists.
There are as many types and styles of lead singer as there are styles and genres of music. However, the lead singer of a group or band is usually the main focus of audiences' attention.[4] The lead vocalist of a band is sometimes called the front man or front woman, as the most visible performer in a group. While most bands have a singular lead singer, many others have dual lead singers, or other member of the band that occasionally sing lead on particular songs.