Task: Question Answering
Input (English): Passage: Following the release of The Final Cut, Waters embarked on a solo career. In 1984, he released his first solo album, The Pros and Cons of Hitch Hiking, a project about a man's dreams across one night that dealt with Waters' feelings about monogamy and family life versus "the call of the wild". In the end the character, Reg, chooses love and matrimony over promiscuity. The album featured guitarist Eric Clapton, jazz saxophonist David Sanborn, and artwork by Gerald Scarfe. Kurt Loder described The Pros And Cons of Hitch Hiking as a "strangely static, faintly hideous record". Rolling Stone rated the album a "rock bottom one star". Years later, Mike DeGagne of AllMusic praised the album for its "ingenious symbolism" and "brilliant use of stream of consciousness within a subconscious realm", rating it four out of five stars.Waters began touring in support of the album, aided by Clapton, a new band, new material, and a selection of Pink Floyd favourites. Waters débuted his tour in Stockholm on 16 June 1984. The tour suffered from poor ticket sales and some performances at larger venues were cancelled; Waters estimated that he lost £400,000 on the tour. In March 1985, Waters went to North America to play smaller venues with the Pros and Cons Plus Some Old Pink Floyd Stuff—North America Tour 1985. The Pros and Cons of Hitch Hiking has been certified Gold by the RIAA.In 1986, Waters contributed songs and a score to the soundtrack of the animated movie When the Wind Blows, based on the Raymond Briggs book of the same name. His backing band featuring Paul Carrack was credited as The Bleeding Heart Band. In 1987, Waters released Radio K.A.O.S., a concept album based on a mute man named Billy from an impoverished Welsh mining town who has the ability to physically tune into radio waves in his head. Billy first learns to communicate with a radio DJ, and eventually to control the world's computers. Angry at the state of the world in which he lives, he simulates a nuclear attack. Waters followed the release with a supporting tour also in 1987. 
Question: What is the name of the mute man in the concept album released by the person who began a solo career in 1984?
Output (English): Billy.