Question:  backing vocals on "Little Black Dress" were contributed by Bono and an English-born Irish musician who has recorded how many studio albums with U2?

Context paragraphs:
Little black dress: A little black dress (LBD) is a black evening or cocktail dress, cut simply and often quite short.  Fashion historians ascribe the origins of the little black dress to the 1920s designs of Coco Chanel and Jean Patou intended to be long-lasting, versatile, affordable, accessible to the widest market possible and in a neutral colour.  Its ubiquity is such that it is often simply referred to as the "LBD".

Smile Smile: Smile Smile was an American folk pop indie rock band based in Dallas, Texas.  The band is made up of Jencey Hirunrusme (piano and vocals) and Ryan Hamilton (guitar and vocals).  At various times Smile Smile has played with a variety of drummers including Jeff Gilroy (Red Monroe), Michael Ratliff (Calhoun, Odis) and Cooper Heffley (Little Black Dress).

Shag Tobacco: Shag Tobacco is the third solo album from Gavin Friday.  Once again, Friday teamed up with musician Maurice "The Man" Seezer.  Bono and The Edge contribute backing vocals on "Little Black Dress."  "The Last Song I'll Ever Sing" was dedicated "in loving memory" of Thom McGinty, The Diceman (1954-1995).

Little Black Dress (disambiguation): A little black dress is an evening or cocktail dress.

Party dress: A party dress is a dress worn especially for a party.  Different types of party such as children's party, cocktail party, garden party and costume party would tend to require different styles of dress.  One classic style of party dress for women in modern society is the little black dress.

Black Givenchy dress of Audrey Hepburn: The black Givenchy dress of Audrey Hepburn is a little black dress designed by Hubert de Givenchy and worn by Audrey Hepburn in the opening of the 1961 romantic comedy film "Breakfast at Tiffany's".  The dress is cited as one of the most iconic items of clothing in the history of the twentieth century and perhaps the most famous "little black dress" of all time.

Little Black Dress (film): Little Black Dress (; lit.  My Black Mini Dress) is a 2011 South Korean film starring Yoon Eun-hye, Park Han-byul, Cha Ye-ryun and Yoo In-na.  Based on the 2009 chick lit novel "My Black Mini Dress" by Kim Min-seo, the film revolves around the dreams, failures, and friendship of four 24-year-old women still looking for a direction in life.

The Edge: David Howell Evans (born 8 August 1961), better known by his stage name The Edge (or just Edge), is an English-born Irish musician and songwriter best known as the lead guitarist, keyboardist and backing vocalist of the rock band U2.  A member of the group since its inception, he has recorded 13 studio albums with the band as well as one solo record.  As a guitarist, the Edge has crafted a minimalistic and textural style of playing.  His use of a rhythmic delay effect yields a distinctive ambient, chiming sound that has become a signature of U2's music.

Basic dress: A basic dress is a usually dark-colored dress of simple design which can be worn with various accessories to suit different occasions.  Different kinds of jewelry, belts, scarves, and jackets can be worn with the basic dress to dress up or down.  A little black dress is an example of a basic dress.

Dik Evans: Richard G. "Dik" (also "Dick") Evans (born 1957) is an English-born Irish musician best known as a founder of the band Virgin Prunes and an early member of U2.  Dik and his brother, David "The Edge" Evans, U2's guitarist, were among the group's co-founders.

Supporting paragraphs: Shag Tobacco The Edge
Answer: 13