Question: Graeme Strachan and Dan Andriano, have which mutual occupations?

Context paragraphs:
The Falcon (band): The Falcon is a Chicago-based punk rock supergroup.  The band features The Lawrence Arms members Brendan Kelly (guitar and vocals) and Neil Hennessy on drums, as well as Alkaline Trio's Dan Andriano (vocals and bass).  Todd Mohney of Rise Against played guitar on the 2004 "God Don't Make No Trash or Up Your Ass with Broken Glass" EP but could not attend the recording session for the band's first full length "Unicornography", and his spot was temporarily filled in by Kelly and Hennessy.

Sundials (song): "Sundials" (stylized as "Sun Dials") is the debut single by the Chicago-based punk rock band Alkaline Trio, released in 1997 by Johann's Face Records.  It is the band's only studio release to include original bassist Rob Doran, who left the group after the single's release and was replaced by Dan Andriano.  Both tracks from the single were reissued on the compilation album "Alkaline Trio" in 2000.

David Dunbar (actor): David Dunbar (14 September 1886 – 7 November 1953) was an Australian film actor.  Dunbar was a prominent actor in American and British silent films, particularly in westerns, but switched to playing more minor roles after the arrival of sound.  In later years he appeared mostly in British-themed Hollywood films.  He was one of the first film actors beginning his screen career with Pathe Freres, Paris in 1910.  Previously he was an actor on the legitimate stage both in Australia, his homeland and in Britain.  On 7 March 1926 his wife Blanche was killed in a car collision in the Hollywood Hills.  He had one sister, Miriam Kathleen (Strachan) Dunbar who remained in Petersham, New South Wales.  Miriam married William Thomas Strachan, the children of that marriage being Miriam Kathleen and William James Strachan.  William James (Bill) returned from the Second World War to Australia and settled with his wife Barbara (Grant) Strachan in Sydney and later in Melbourne, Victoria, bringing up three children, Susan Marion, William Grant and Scott James Strachan.  The Strachan family included Graeme Ronald (Shirley) Strachan, a media personality and lead singer of the 1970s rock group "Skyhooks".  Miriam Kathleen married Ronald George Fordham, who perished as a prisoner of war in Malaya during the Second World War.  Miriam Kathleen died in 1944, leaving Brian Ronald and Joan Fordham.

Alkaline Trio discography: The discography of Alkaline Trio, a Chicago-based punk rock band, consists of nine studio albums, two compilation albums, one split album, four EPs, one video album, sixteen singles, one demo, nine digital releases, and thirteen music videos. Alkaline Trio formed in 1996 with an initial lineup of Matt Skiba (guitar, vocals), Rob Doran (bass guitar, backing vocals), and Glenn Porter (drums).  This lineup released the band's demo tape and the 1997 single "Sundials" on Chicago record label Johann's Face Records, after which Doran left the band and was replaced by Dan Andriano.  The group then signed to Asian Man Records and released their debut EP "For Your Lungs Only" and album "Goddamnit" in 1998.  A second EP, "I Lied My Face Off", followed in 1999 and resulted in their first music video, for the song "Goodbye Forever".  In 2000 Asian Man released the band's second album, "Maybe I'll Catch Fire", as well as the compilation album "Alkaline Trio", collecting most of their previously released early material.  Porter then left and was replaced by Mike Felumlee.

Tuesday (band): Tuesday was a pop punk band formed by three ex-members of Chicago ska punk band Slapstick after the latter's breakup in 1996.  The band's initial line-up consisted of Dan Andriano (bass/vocals), Matt Stamps (guitar), and Rob Kellenberger (drums/vocals).  They released a demo on 1133 in 1996, before releasing an EP, titled "Early Summer", on Asian Man Records in 1997.  Later in the year, they acquired a second guitarist, Tyler Wiseman, and released their first and only album, "Freewheelin".  Following a tour of U.S. in support of the album, the band broke up.  Shortly thereafter, Andriano joined Alkaline Trio.

Alkaline Trio: Alkaline Trio is an American alternative rock band from McHenry, Illinois.  The band consists of guitarist and vocalist Matt Skiba, bassist and vocalist Dan Andriano, and drummer Derek Grant.  Founded in late 1996 by Skiba, bassist Rob Doran, and drummer Glenn Porter, Alkaline Trio released its debut single, "Sundials", in 1997.  Following its release, Doran departed from the band and was replaced by Andriano.  The band subsequently recorded an EP, "For Your Lungs Only" (1998), and its debut studio album, "Goddamnit" (1998).  Following the release of the band's second album, "Maybe I'll Catch Fire" (2000), Porter left the band and was replaced by Mike Felumlee for its subsequent album, "From Here to Infirmary" (2001).

The Best of Skyhooks: The Best of Skyhooks is the second compilation album released in 1979 by Australian band Skyhooks, following "The Skyhooks Tapes" in 1977.  The album was released following the departure of lead singer Graeme Strachan in late 1978.  The album peaked at number 9 in Australia.

Hurricane Season (album): Hurricane Season is the first studio album by Alkaline Trio vocalist and bassist Dan Andriano, released on August 9, 2011 through Asian Man Records.  The album is primarily acoustic, and was met with positive critical reception, being given a 4.5/5 by PunkNews, and a 4/5 by Alternative Press.

Dan Andriano: Daniel Michael Andriano (born June 27, 1977) is an American singer, songwriter and musician best known as the co-lead vocalist and bassist of the punk rock band Alkaline Trio, with whom he has recorded eight studio albums.

Graeme Strachan: Graeme Ronald Strachan (2 January 195229 August 2001), professionally billed and known as "Shirley" Strachan or Shirl, was an Australian singer, songwriter, radio and television presenter, and carpenter.  He was the lead singer of the rock group Skyhooks (1974–1978, 1983, 1984, 1990, 1994).  While still a member of Skyhooks he had solo singles, which charted on the Kent Music Report, with cover versions of "Every Little Bit Hurts" (October 1976, No. 3) and "Tracks of My Tears" (July 1977, top 20).  After leaving Skyhooks in July 1978 he concentrated on his solo career.  He was the host of "Shirl's Neighbourhood" (1979–83), a children's TV show.  From 1993 he appeared on home renovation TV program, "Our House", as a carpenter and co-host.  At the ARIA Music Awards of 1993, Skyhooks were inducted into the ARIA Hall of Fame.  Strachan died in 2001 in a self-piloted helicopter accident.

Supporting paragraphs: Graeme Strachan Dan Andriano
Answer: singer, songwriter