Question: Andrew Stockdale and Andy Childs, have which occupations in common?
Context: "White Unicorn" is a song by Australian hard rock band Wolfmother, featured on their 2005 debut studio album "Wolfmother".  Written by band members Andrew Stockdale, Chris Ross and Myles Heskett, it was released as the second single from the album in Australia on 26 February 2006. Keep Moving is the debut solo extended play (EP) by Australian musician Andrew Stockdale.  Recorded throughout 2012 and 2013 in Byron Bay, the EP features four songs from Stockdale's upcoming debut solo album of the same name.  It was released by Universal on 26 April 2013 in Australia, Germany and Austria, on 28 April in the United Kingdom and the rest of Europe, and on 30 April in the United States. Andrew James Stockdale (born 20 July 1976) is an Australian rock musician, singer and songwriter best known as the lead vocalist, lead guitarist and only mainstay member of the rock band Wolfmother, which formed in 2000.  In 2007, alongside his Wolfmother bandmates, he won 'Songwriter of the Year' at the APRA Awards.  Aside from his work with Wolfmother, Stockdale was featured on the 2010 single "By the Sword" by Slash. Wolfmother are an Australian hard rock band from Sydney, New South Wales.  Formed in 2000 by vocalist and guitarist Andrew Stockdale, bassist and keyboardist Chris Ross and drummer Myles Heskett, the group currently includes Stockdale, bassist and keyboardist Ian Peres and drummer Hamish Rosser.  Wolfmother released their self-titled debut album "Wolfmother" in Australia in 2005 and internationally in 2006.  The album reached number 3 on the Australian Albums Chart and the top 40 in the US and the UK, and has to date sold over 1.5 million copies worldwide. Keep Moving is the debut solo studio album by Australian hard rock musician Andrew Stockdale.  Initially conceived as the third album by Stockdale's band Wolfmother, it was later announced to be a solo album after the disbandment of the group in March 2013.  Recorded by Wolfmother between 2011 and 2013, "Keep Moving" was released by Universal in June 2013. "Dimension" is a song by Australian hard rock band Wolfmother, featured on their 2005 debut studio album "Wolfmother".  Written by band members Andrew Stockdale, Chris Ross and Myles Heskett, it was released as the second single from the album in Europe (and the third single overall) on 17 April 2006, charting at number 49 on the UK Singles Chart. "Back Round" is a song by Australian hard rock band Wolfmother.  Written by vocalist and guitarist Andrew Stockdale, the song was the first material released since original band members Chris Ross and Myles Heskett left the band in August 2008.  "Back Round" was originally released as a free digital download on the band's official website on 30 March 2009, and was later released as a downloadable single on iTunes on 26 May 2009.  In October 2009 the song was featured on the deluxe edition of the band's second album, "Cosmic Egg". Andy Childs (born December 7, 1962 in Memphis, Tennessee) is an American country music singer-songwriter.  In 1993, Childs released one studio album for RCA, which produced three singles on the "Billboard" Hot Country Singles & Tracks chart.  His highest charting single, "Simple Life," peaked at No. 61 in 1994. "Victorious" is a song by Australian hard rock band Wolfmother.  Written by vocalist and guitarist Andrew Stockdale, it was produced by Brendan O'Brien and serves as the title track for the band's 2016 fourth studio album "Victorious".  The song was released as the first single from the album on 20 November 2015 and reached number 26 on the US "Billboard" Mainstream Rock Songs chart. Wolfmother are an Australian hard rock band formed in Sydney, New South Wales in 2000.  Originally a trio featuring vocalist and guitarist Andrew Stockdale, bassist and keyboardist Chris Ross, and drummer Myles Heskett, the group released their self-titled debut album in Australia in 2005, with all 12 tracks credited equally to all three band members.  Four songs – "Dimension", "Woman", "White Unicorn" and "Apple Tree" – had originally been released on the band's self-titled debut EP the previous year.  When "Wolfmother" was released internationally in 2006, it also featured "Love Train".  In May 2007, the band contributed "Pleased to Meet You" to the "Spider-Man 3" soundtrack.
Answer: singer and songwriter