Question: Kelli Ali and Justin Currie, share which occupation?

Context paragraphs:
Iain Harvie: Iain Wallace Harvie (born 19 May 1962 in Glasgow, Scotland) is the guitarist with the Scottish rock band Del Amitri.  Along with lead singer and bassist Justin Currie, Harvie is one of only two members to be present throughout Del Amitri's history since its 1982 inception.  He is also the co-writer, with Currie, of many of the group's songs.

Lower Reaches: Lower Reaches is the third solo album by singer/songwriter Justin Currie, best known for his involvement in the band Del Amitri.

Del Amitri: Del Amitri is a Scottish alternative rock band, formed in Glasgow, Scotland in 1983.  The band grew out of Justin Currie's Jordanhill College School band and came together after a teenaged Currie placed an advertisement in the window of a music store asking for people who could play to contact him.  The band was formed with the original line-up of Currie (bass and vocals), Iain Harvie (lead guitar), Bryan Tolland (guitar) and Paul Tyagi (drums).  Currie and Harvie were the only members of the band to remain present throughout its history.  They were also the main songwriters of the group.

Kelli Ali: Kelli Dayton, also known as Kelli Ali (a name she took to honour her father, Michael Ali) is a female vocalist most recognized for being lead singer for the trip hop group Sneaker Pimps.

What Is Love For: What is Love For is the first solo album by singer/songwriter Justin Currie, best known for his involvement in the band Del Amitri.

The Great War (album): The Great War is the second solo album by singer/songwriter Justin Currie, best known for his involvement in the band Del Amitri.

Justin Currie: Justin Robert Currie (born 11 December 1964) is a Scottish singer and songwriter, best known as a founding member of the band Del Amitri and, along with Iain Harvie, is one of only two members of the group to be present throughout its entire existence.

Justin Currie (American football): Justin Currie (born September 19, 1993) is an American football safety who is currently a free agent.  He played college football at Western Michigan and was signed by the New York Giants as an undrafted free agent in 2015.

Rocking Horse (Kelli Ali album): Rocking Horse is the third solo album from singer-songwriter Kelli Ali and was released through One Little Indian Records on 24 November 2008 in the United Kingdom.

Long Hard Road Out of Hell: "Long Hard Road Out of Hell" is a song written and performed by American rock band Marilyn Manson, released as a single from the soundtrack to the 1997 motion picture "Spawn".  It also appears on the band's compilation album "", and has been used in theatrical trailers for "Bless the Child", "From Hell", and "Season of the Witch".  It features backing vocals from former Sneaker Pimps vocalist Kelli Ali.

Supporting paragraphs: Kelli Ali Justin Currie
Answer: singer