Greenhouse gas. A greenhouse gas (abbrev. GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone.
A musician is a person who plays a musical instrument like a guitar or a piano or a person that sings. A musician is also someone who writes music, even if they write it for other people to play. People who write music are called composers. Usually that part is left out if they also play or sing the music they write, but they are still composers because they wrote the music.
Lisa Gerrard is an Australian musician, singer and composer who rose to prominence as part of the music group Dead Can Dance with music partner Brendan Perry. In addition to singing, she is an instrumentalist for much of her work, most prolifically using the yangqin. Since her career began in 1981, Gerrard has been involved in a wide range of projects. She received a Golden Globe Award for the music score to the film Gladiator, on which she collaborated with Hans Zimmer.