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Radio is the wireless transmission of signals, by modulation of electromagnetic waves with frequencies below those of light.

Radio waves

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Radio waves are a form of electromagnetic radiation, created whenever a charged object (in normal radio transmission, an electron) accelerates with a frequency that lies in the radio frequency (RF) portion of the electromagnetic spectrum. In radio, this acceleration is caused by an alternating current in an antenna. Radio frequencies occupy the range from a few tens of hertz to a few hundred gigahertz.

ELF - SLF - ULF/VF - VLF - LF/LW - MW - HF/SW - VHF - UHF - SHF - EHF Electromagnetic radio spectrum

Other types of electromagnetic radiation, with frequencies above the RF range, are infrared, visible light, ultraviolet, X-rays and gamma rays. Since the energy of an individual photon of radio frequency is too low to remove an electron from an atom, radio waves are classified as non-ionizing radiation.
Electromagnetic spectrum and diagram of radio transmission of an audio signal.

Electromagnetic radiation travels (propagates) by means of oscillating electromagnetic fields that pass through the air and the vacuum of space equally well, and does not require a medium of transport (such as the aether). When radio waves pass an electrical conductor, the oscillating electric or magnetic field (depending on the shape of the conductor) induces an alternating current and voltage in the conductor. This can be transformed into audio or other signals that carry information. The word 'radio' is used to describe this phenomenon, and television, radio, radar, and cell phone transmissions are all classed as radio frequency emissions.

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Radio - Twitter Search

BLK RADIO: O talks down blks, need reg ppl round him. Lobby powerful, change entire system.
rockstarpolitic (rockstarpolitic) Tue, 29 Dec 2009 07:13:21 -0000
BLK RADIO: O talks down blks, need reg ppl round him. Lobby powerful, change entire system.
RT @ladygaga: THE FAME is the first album in history to have four #1 radio hits! i wish i could wrap my arms around my little monsters, ...
liezl090 (Liezl Baronia) Tue, 29 Dec 2009 07:13:19 -0000
RT @ladygaga: THE FAME is the first album in history to have four #1 radio hits! i wish i could wrap my arms around my little monsters, ...
@justinbieber: WE LEARNED THE HAND THING YOU TAUGHT JAKE ON RADIO DISNEYYY ! yupp, we're skilled (
Maryjaneexo (Maryjane Doesntfit) Tue, 29 Dec 2009 07:13:18 -0000
@justinbieber: WE LEARNED THE HAND THING YOU TAUGHT JAKE ON RADIO DISNEYYY ! yupp, we're skilled (
#SECRETTURNOFF TOUCHING MY RADIO BECAUSE YOU MY GIRL DON'T MAKE THAT SHIT OK LOL
WILLIEOWITCHER (willie witcher) Tue, 29 Dec 2009 07:13:15 -0000
#SECRETTURNOFF TOUCHING MY RADIO BECAUSE YOU MY GIRL DON'T MAKE THAT SHIT OK LOL
Hoy dijeron en el radio que no hagamos propositos sino que informemos al año nuevo que vamos a hacer en el,es buena idea ire pensando...
skavelslp (Salvador Velazquez) Tue, 29 Dec 2009 07:13:10 -0000
Hoy dijeron en el radio que no hagamos propositos sino que informemos al año nuevo que vamos a hacer en el,es buena idea ire pensando...
@justinbieber: WE LEARNED THE HAND THING YOU TAUGHT JAKE ON RADIO DISNEYYY ! yupp, we're skilled (:
Maryjaneexo (Maryjane Doesntfit) Tue, 29 Dec 2009 07:13:06 -0000
@justinbieber: WE LEARNED THE HAND THING YOU TAUGHT JAKE ON RADIO DISNEYYY ! yupp, we're skilled (:

 

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Celtic Connections - Produced in the studios of WSIU-FM on the campus of Southern Illinois University at Carbondale, and syndicated via the public radio satellite system. Includes station listing, playlist, and information on programs.

Celtic Quest - Internet radio, playing traditional and contemporary Celtic music. Includes festival listings, and artist profiles.

Celtic Radio on the Internet - A schedule with all known Celtic music and culture radio programmes broadcast on the Internet from the British Isles.

CelticMelt - Streaming MP3 broadcast of celtic and celtic-inspired new age music. Includes information on artists, CDs and playlist.

CelticMusicRadio - A community-oriented radio station operating in the Central Belt of Scotland, providing greater exposure to Celtic Music.

Ceolas Worldwide Celtic Music Radio Listing - A listing from Ceolas of radio shows featuring Celtic music, mostly in the US, but some foreign listings are included.
Meta Description: [ Comprehensive listing of celtic music radio shows around the world, from Ceolas. ]

Highlander Radio - Internet only radio station broadcasting a wide range of Celtic music 24 hours day.

RenRadio - Renaissance and traditional Celtic music broadcast. MP3 stream-capable player required for listening.
Meta Description: [ Renaissance and Celtic faire music internet radio. For fans of Irish, Scotish, Celtic music. Including pub Songs and Pirate shanty's. ]

Sound of Erin - Radio programs (with streaming audio) of music from the celtic regions and the maritime provinces of Canada.Broadcast on WNTN, MA.

The Thistle and Shamrock - Official page for NPR's weekly program of Celtic music, hosted by Fiona Ritchie since 1981.
Meta Description: [ Guided by your host Fiona Ritchie and National Public Radio, step into the heart of Celtic music, an ancient tradition of reels, jigs, ballads, and laments. ]