Question: What nationality do James Dewar from Stone the Crows, and Luca Prodan of Argentine rock band Sumo have in common

Context articles: Miguel Mateos
Sumo (band)
Luca Prodan
Oktubre
Andrea Prodan
James Dewar (musician)
Las Pelotas
Divididos
Sandro de América
La era de la boludez

Miguel Mateos (born January 26, 1954) is an Argentine rock singer-songwriter from Villa Pueyrredón, Argentina.
 Outside Argentina he is considered one of the most important exponents of Rock en Español, specially in the 1980s when he along with Charly Garcia, Soda Stereo, Enanitos Verdes, Virus, Sumo, Fabulosos Cadillacs, Rata Blanca, and many more bands became international stars in the so-called "Argentine Invasion" (""La Ola Argentina"") of rock music that swept Latin America and parts of North America and Europe.
 It helped popularize Spanish-language rock outside Argentina, and make the genre a commercially successful industry.
Sumo was a 1980s Argentine alternative rock band, merging "post-punk" with "reggae".
 Headed by Italian-born Luca Prodan, it remained underground for most of its short activity, but was extremely influential in shaping contemporary Argentine rock.
 Sumo introduced British post-punk to the Argentine scene, with many lyrics in English.
 And provided a visceral counterpoint to the progressive and nueva canción influences then dominant in "Rock en Español".
Luca Prodan (17 May 1953 – 22 December 1987) was an Italian–Scotish musician and singer.
 He was the leader and singer of Sumo, one of the most influential rock bands of Argentina, and is widely considered as one of the most important artists of the last quarter of the twentieth century in his country.
Oktubre is the second studio album by Argentine rock band Patricio Rey y sus Redonditos de Ricota, released in 1986.
 It is the band's last album to feature to Piojo Ávalos, Tito D'Aviero and Willy Crook as band members, who left the band after the tour between late 1986 and early 1987.
 "Oktubre" is ranked at #4 in the Argentine version of Rolling Stone's "Los 100 Mejores Discos del Rock Nacional" (The 100 Greatest Records in Argentine Rock).
Andrea Prodan (born 16 November 1961) Scottish-Italian film actor, composer and musician is the younger brother of Argentine rock star Luca Prodan.
 The Prodan family, after suffering internment in a Japanese concentration camp during WW II, was expelled from China due to Mao.
 Andrea's Italian father was an author and talented sportsman, and had run a prosperous business, with expertise in ancient Chinese pottery.
 His mother is Scottish.
James Dewar (12 October 1942 – 16 May 2002) was a Scottish musician best known as the bassist and vocalist for Robin Trower and Stone the Crows, the latter having its beginnings as the resident band at Burns Howff in Glasgow.
Las Pelotas (in English: "The Balls"); is an Argentine band rock and reggae, from Córdoba.
 This band was formed after the separation of Sumo, due to the death of their singer, Luca Prodan in 1987.
 The group currently consists of vocalist and guitarist, Germán Daffunchio, Gabriela Martínez on bass, Tomás Sussman on guitar, Sebastián Schachtel on Keyboards and Gustavo Jove on drums.
 Their original vocalist, Alejandro Sokol, was part of the band from 1988 to 2008; year that begins his solo career, cut short by his sudden death in 2009.
Divididos ("Divided") is an Argentine rock band.
 The band was formed in 1988 after the death of Luca Prodan and the consequent dissolution of the band Sumo.
 Ricardo Mollo (vocals, guitar) and Diego Arnedo (bass guitar) joined drummer Gustavo Collado to form a band named "La División" (The Division), which would be later called "Divididos".
Roberto Sánchez-Ocampo (August 19, 1945 – January 4, 2010), better known by his artist names Sandro/Sandro de América ("Sandro of America"), "Gitano" (gypsy), and the Argentine Elvis, was a notable Argentine singer and actor.
 He is considered The father of Argentine Rock for being one of the first rock artists to sing in Spanish in Latin America.
 He edited 52 official records and sold 50 million copies although other sources state that he sold over 75 million.
 Some of his most successful songs are "Dame fuego", "Rosa, Rosa", "Quiero llenarme de ti", "Penumbras", "Porque yo te amo", "Así", "Mi amigo el Puma", "Tengo", "Trigal" and "Una muchacha y una guitarra".
 The single "Rosa, Rosa" sold 2 million copies, being his most recognizable and famous song.
 Another of his hits, "Tengo" was given 15th place among the 100 best Argentine rock songs by both the MTV channel and "Rolling Stone" magazine.
La era de la boludez [Age of stupidity] is a studio album released in 1993 by Argentine rock band Divididos.
 It contains a lot of the most famous songs by the group, as "El arriero" (original by Atahualpa Yupanqui), "¿Qué ves?"
 and "Salir a comprar".
 It is listed in seventh place in Rolling Stone Argentina list of 100 best records of Argentine rock and is the best-selling album of Divididos, selling over 480,000 copies.