There are two types of radio networks currently in use around the world: the one-to-many broadcast network commonly used for public information and mass media entertainment; and the two-way type used more commonly for public safety and public services such as police, fire, taxicabs, and delivery services. Many of the same components and much of the same basic technology applies to both.

The Two-way type of radio network shares many of the same technologies and components as the Broadcast type radio network but is generally set up with fixed broadcast points (transmitters) with co-located receivers and mobile receivers/transmitters or Tran-ceivers. In this way both the fixed and mobile radio units can communicate with each other over broad geographic regions ranging in size from small single cities to entire states/provinces or countries. There are many ways in which multiple fixed transmit/receive sites can be interconnected to achieve the range of coverage required by the jurisdiction or authority implementing the system: conventional wireless links in numerous frequency bands, fibre-optic links, or micro-wave links. In all of these cases the signals are typically backhauled to a central switch of some type where the radio message is processed and resent (repeated) to all transmitter sites where it is required to be heard.

David Jon Gilmour,CBE (born 6 March 1946) is an English rock musician and multi-instrumentalist who is best known as the guitarist, one of the lead singers and main songwriters in the progressive rock band Pink Floyd. It is estimated that as of 2010, the group have sold over 250 million records worldwide, including 74.5 million units sold in the United States.

In addition to his work with Pink Floyd, Gilmour has worked as a producer for a variety of artists, and has enjoyed a successful career as a solo artist. Gilmour has been actively involved with many charities over the course of his career.

In 2003, he was appointed CBE for his charity work and was awarded with the Outstanding Contribution title at the 2008 Q Awards. In 2011, Rolling Stone Magazine ranked him number 14 in their list of the greatest guitarists of all time.

Gilmour was born in Cambridge, England. His father, Douglas Gilmour, was a senior lecturer in zoology at the University of Cambridge and his mother, Sylvia (née Wilson), was a teacher and film editor who raised her family at Grantchester Meadows, later immortalised by a Roger Waters song on Pink Floyd's Ummagumma. He has a younger brother who is also a musician.

Tori Amos (born Myra Ellen Amos; August 22, 1963) is an American pianist, singer-songwriter and composer. Amos originally served as the lead singer of 1980s synthpop group Y Kant Tori Read, and as a solo artist was at the forefront of a number of female singer-songwriters in the early 1990s. She was also noteworthy early in her solo career as one of the few alternative rock performers to use a piano as her primary instrument. Some of her charting singles include "Crucify", "Silent All These Years", "God", "Cornflake Girl", "Caught a Lite Sneeze", "Professional Widow", "Spark", "1000 Oceans", and "A Sorta Fairytale", her most commercially successful single in the U.S. to date.

As of 2005, Amos had sold 12 million albums worldwide. She has been nominated for 8 Grammy Awards. Amos was also named one of People Magazine's 50 Most Beautiful People in 1996.

Amos was born in Newton, North Carolina. When she was two, her family moved to Baltimore, Maryland, where she began to play the piano. By age five, she had begun composing instrumental pieces on piano and, while living in Rockville, Maryland, she won a full scholarship to the Preparatory Division of the Peabody Conservatory of Music. Her scholarship was discontinued at age 11 and she was asked to leave. Amos has asserted that she lost the scholarship because of her interest in rock and popular music, coupled with her dislike for reading from sheet music. In 1972, The Amos family moved to Silver Spring, Maryland, where her father, Reverend Edison Amos, became pastor of the Good Shepherd United Methodist church. At the age of 13 she began playing at gay bars and piano bars, chaperoned by her father.