Context_1 : An electric musical instrument is one in which the use of electric devices determines or affects the sound produced by an instrument. Electric musical instruments are an example of electric music technology. It is also known as an amplified musical instrument due to the common utilization of an electronic instrument amplifier to project the intended sound as determined by electric signals from the instrument. Two common types of instrument amplifiers are the guitar amplifier and the bass amplifier. This is not the same as an electronic musical instrument, like a synthesizer, which uses entirely electronic means to both create and control sound. Context_2 : Pink Floyd's David Gilmour or simply David Gilmour is a film by David Gilmour from his 1984 tour from the album "About Face" for Europe. The film is mainly a concert performance from The Hammersmith Odeon in London in April 1984. It also features promotional clips. Lastly, a documentary called "After The Floyd" which followed Gilmour on the 1984 solo tour and includes interviews with David on tour buses (the bus driver referred to David as ex-guitarist of Pink Floyd) and in hotel rooms. Also included is more live footage of concerts and soundchecks in Europe. It is now out of production. Context_3 : "High Hopes" is the eleventh and final track from the 1994 Pink Floyd album "The Division Bell", composed by David Gilmour with lyrics by Gilmour and Polly Samson. Its lyrics speak of the things one may have gained and lost in life, written from Gilmour's autobiographic perspective. Gilmour has said that the song is more about his early days, and leaving his hometown behind, than about the seeds of division supposedly planted in Pink Floyd's early days. Douglas Adams, a friend of Gilmour, chose the album title from one verse in this song. Live versions are featured on "Pulse", "Remember That Night" and "Live in Gdańsk". On "", a somewhat shortened version of the song segues into Syd Barrett's "Bike". The segue is accomplished by cutting from the church bell at the end of "High Hopes" to a new bicycle bell sound effect before "Bike" begins. A 7-inch vinyl version of the single was released on a transparent record. Context_4 : David Gilmour in Concert is a DVD of Pink Floyd guitarist David Gilmour's solo concert at the Royal Festival Hall, London in June 2001, as part of the Robert Wyatt-curated Meltdown festival. It also features additional footage recorded during three concerts at the same venue in January 2002. The track selection includes several Pink Floyd compositions in addition to Gilmour's solo works. Guest appearances are made by Floyd colleague Richard Wright, as well as Robert Wyatt and Bob Geldof. It includes the first ever performance of "Smile" a track which would appear almost five years later on Gilmour's third solo album - "On an Island", and Gilmour even plays a few Syd Barrett compositions. Also included is "Je crois entendre encore " ("I still believe I hear"), an aria from Georges Bizet's opera "Les pêcheurs de perles " ("The Pearl Fishers"), with a libretto by Eugène Cormon and Michel Carré, and sung by Gilmour in the original French. Context_5 : About Face is the second solo studio album by the English guitarist-singer-songwriter David Gilmour. It was originally released in March 1984, on the label Harvest in the UK, and Columbia in the US. Co-produced by Bob Ezrin and Gilmour, the album was recorded in 1983, in sessions that took place at Pathé Marconi Studio, in Boulogne-Billancourt, France. Two tracks, "All Lovers Are Deranged" and the more radio-friendly "Love on the Air", were co-written by Gilmour and his long-time friend Pete Townshend, the main songwriter for The Who (Gilmour composed the music and Townshend wrote the lyrics). The remainder of the tracks are credited solely to Gilmour. In May of the same year, fellow Pink Floyd member Roger Waters released his first official solo album "The Pros and Cons of Hitch Hiking". Context_6 : Live in Gdańsk is a live album by David Gilmour. It is a part of his "On an Island" project which includes an album, tour, DVD, and live album. It was released on 22 September 2008. A David Gilmour Signature Series Fender Stratocaster was released at the same time. Context_7 : A musical instrument is an instrument created or adapted to make musical sounds. In principle, any object that produces sound can be considered a musical instrument—it is through purpose that the object becomes a musical instrument. The history of musical instruments dates to the beginnings of human culture. Early musical instruments may have been used for ritual, such as a trumpet to signal success on the hunt, or a drum in a religious ceremony. Cultures eventually developed composition and performance of melodies for entertainment. Musical instruments evolved in step with changing applications. Context_8 : David Jon Gilmour, {'1': ", '2': ", '3': ", '4': "} (born 6 March 1946) is an English guitarist, singer and songwriter best known as a longtime member of the progressive rock band Pink Floyd. He joined group as guitarist and co-lead vocalist in 1968, effectively as a replacement for founder member Syd Barrett, who was dismissed from the band shortly afterwards. Context_9 : Glenn Keith Bidmead (born 3 February 1962) is a Sydney-based singer, songwriter, guitarist, performer and producer. With songwriting partner Steve Glover, he was a founding member of Australian rock band LemonJuice, which enjoyed several years of success in Japan and South Korea. Context_10 : David Gilmour is the debut solo studio album by Pink Floyd guitarist and co-lead vocalist David Gilmour. The album was released in May and June 1978 in the United Kingdom and the United States, respectively. The album reached number 17 in the UK and number 29 on the Billboard US album charts; it was certified Gold in the US by the RIAA. The album was produced by Gilmour, and consists mostly of blues, guitar oriented rock songs except for the piano-dominated ballad "So Far Away". fact_1 : Glenn Keith Bidmead (born 3 February 1962) is a Sydney-based singer, songwriter, guitarist, performer and producer. fact_2 : David Jon Gilmour, {'1': ", '2': ", '3': ", '4': "} (born 6 March 1946) is an English guitarist, singer and songwriter best known as a longtime member of the progressive rock band Pink Floyd. Answer: guitarist
Output: Glenn Bidmead and David Gilmour both played what musical instrument?