Question: What genre of music  did Loudest Whisper debut on a vinyl record format characterized by a speed of 33 ⁄ rpm, a 12 or 10 inch (30 or 25 cm) diameter, and use of the "microgroove" groove specification?

Context paragraphs:
Tempo Records (US): Tempo Records was a mid-20th century United States based record label, headquartered in Hollywood, California.  It was run by Irving B. Fogel.  Tempo bridged the 78 rpm, 45 rpm and 33⁄ rpm generations, releasing discs in all three formats.

Let There Be Love (1953 Joni James album): Let There Be Love is Joni James debut album, recorded in 1953 and released by MGM Records at the end of the year.  It was released in a four-disc 10-inch 78-rpm record box, in both a two-disc 7-inch 45-rpm extended-play foldout album and a four-disc 45-rpm regular-play box and on a 10-inch 33⅓-rpm album.  The serial number, 222, coincidentally included James's lucky number, "22," which appeared in many of her record serial numbers all over the world.  The album is the first to present its songs as a book in music, opening with "Let There Be Love" and closing with "I'll Be Seeing You", with the songs telling a story start to finish.  The memorable cover was done at M-G-M Pictures Studios in Culver City by artist Russ Gale.  From the album a single of "Let There Be Love" and "You're Nearer" was shipped to radio stations.  Then, by public demand, a single of "You're My Everything" and "You're Nearer" was released.  This album offered Joni's second recording of "Let There Be Love," which had been released in an earlier version in 1952 as her first single on Sharp Records in Chicago, then going to M-G-M Records for further distribution.  Both recordings were arranged and conducted by Lew Douglas.  "Let There Be Love" went to the top of the album charts and was the sixth-best-selling album of 1953.  In 1956 the album was reissued as a 12-inch L.P. and in three single EPs; there was no EP set including the entire album.  For this release, four Joni James singles were added, but one of them had never been released.  That was "I Need You Now," which was to have followed the hit "My Love, My Love" but was canceled when Eddie Fisher came out with a version recorded several weeks after Joni's.  M-G-M had expected Joni's original version to go straight to #1.  For the new album the first four songs and second four songs were switched to get "You're My Everything" in the outside groove of the L.P. to facilitate disc jockey play.  So, for 50 years, the story the album tells has been garbled.  In 1961 the album got new cover art, a new serial number (E3931), and an electronically simulated stereo release.  Released again on compact disk with yet more bonus tracks, the album is in its fifth decade as a best seller.  Joni James hopes for yet another release which will restore the original song order.  Significantly, for her last M-G-M album, "Bossa Nova Style", Joni included new recordings of several songs from "Let There Be Love", including a new single of "You're Nearer."  That album was arranged by Lew Douglas's protégé Chuck Sagle.  This information comes from Wayne Brasler, longtime President of the Joni James International Fan Club and the writer of the album notes for all Joni James' CD releases.

Running Free: "Running Free" is the debut single by Iron Maiden, released on 8 February 1980 on the 7" 45 rpm vinyl record format.  It was written by Steve Harris and Paul Di'Anno.  The song appears as the third track on the band's debut album "Iron Maiden" (and the fourth track on its 1998 re-release).  In 1985, a live version of the song was released as the first single from "Live After Death" (the band's twelfth single).  In 1990, the original single was reissued on CD and 12" vinyl as part of "The First Ten Years" box, in which it was combined with the band's next single, "Sanctuary".  The 1985 live single was also released as part of this box set, combined with 1985's "Run to the Hills".

Porgy and Bess (1950 album): This album is a 1950 recording of selections from George Gershwin's opera Porgy and Bess, sung by the noted opera stars Robert Merrill and Risë Stevens.  The album featured no black singers at all, even though the opera was written for a mostly African-American cast (the whites in the opera speak, but do not sing).  It was recorded by RCA Victor on September 12 and September 13, 1950.  The album was originally released on one twelve-inch 33⁄ rpm LP with the catalog number LM 1124.

LP record: The LP (from "long playing" or "long play") is an analog sound storage medium, a vinyl record format characterized by a speed of 33 ⁄ rpm, a 12 or 10 inch (30 or 25 cm) diameter, and use of the "microgroove" groove specification.  Introduced by Columbia in 1948, it was soon adopted as a new standard by the entire record industry.  Apart from a few relatively minor refinements and the important later addition of stereophonic sound, it has remained the standard format for vinyl albums.

Album: An album is a collection of audio recordings issued as a single item on CD, record, audio tape or another medium.  Albums of recorded music were developed in the early 20th century, first as books of individual 78rpm records, then from 1948 as vinyl LP records played at 33 ⁄  rpm.  Vinyl LPs are still issued, though in the 21st-century album sales have mostly focused on compact disc (CD) and MP3 formats.  The audio cassette was a format used alongside vinyl from the 1970s into the first decade of the 2000s.

Album era: The Album era was a period in English-language popular music from the mid 1960s to the mid 2000s in which the album was the dominant form of recorded music expression and consumption.  It was primarily driven by three successive music recording formats, the 33⁄  rpm phonograph (gramophone) record, the audiocassette and the music compact disc.

The Children of Lir (Loudest Whisper album): The Children of Lir is the debut album by Irish folk rock/progressive folk group Loudest Whisper.  It is the studio adaption of the musical of the same name that was performed in Fermoy, Ireland in 1973.  The album was released on LP record in Ireland by Polydor Records in 1974 in a limited edition of 500 copies.

List of number-one EPs in the United Kingdom: In the 1950s and 1960s "a third vinyl format" was introduced alongside long-playing (LP) albums, and singles.  The extended play (EP) used the same formats as singles but contained more tracks.  Singles were the popular record format at the time – predominantly 10-inch 78 rpm and 7-inch 45 rpm formats – and the first singles chart was published by "New Musical Express" in 1952 with many other publications also producing singles charts in the 1950s and 1960s. " Record Mirror" published the first album chart in 1956 and, when "Record Retailer" began compiling an LP chart on 12 March 1960, they also compiled an EP chart.  The EP chart consisted of a top ten and was expanded to fifteen positions the following week, and twenty the week after that.  EPs "died out in the late 1960s" and "Record Retailer" reduced the chart to ten positions on 16 April 1966, publishing the final EP chart on 16 December 1967.  For six weeks in 1966 and two weeks in December 1967, "Record Retailer" did not publish EP charts but they were compiled and "Record Mirror" published them; "Mirror" had begun publishing charts compiled by "Record Retailer" in March 1962, following a decision to stop compiling their own albums and singles charts.

Vitaphone: Vitaphone was a sound film system used for feature films and nearly 1,000 short subjects made by Warner Bros. and its sister studio First National from 1926 to 1931.  Vitaphone was the last major analog sound-on-disc system and the only one which was widely used and commercially successful.  The soundtrack was not printed on the film itself, but issued separately on phonograph records.  The discs, recorded at 33 ⁄  rpm (a speed first used for this system) and typically 16 in in diameter, would be played on a turntable physically coupled to the projector motor while the film was being projected, achieving a frequency response of 4300 Hz.  Many early talkies, such as "The Jazz Singer" (1927), used the Vitaphone system.  The name "Vitaphone" derived from the Latin and Greek words, respectively, for "living" and "sound".

Supporting paragraphs: The Children of Lir (Loudest Whisper album) LP record
Answer: Irish folk rock/progressive