Background: Hilltop Hoods are an Australian hip hop group that formed in 1994 in Blackwood, Adelaide, South Australia. The group was founded by Suffa (Matthew David Lambert) and MC Pressure (Daniel Howe Smith), who were joined by DJ Debris (Barry John M. Francis) after fellow founder, DJ Next (Ben John Hare), left in 1999. The group released its first extended play, Back
Context: In 2006 Hilltop Hoods were nominated for five ARIA Awards - the first ever for an Australian hip hop group - winning in two categories: 'Best Urban Release' and 'Best Independent Release'. The following year they won 'Best Urban Release' at the ARIA Awards for The Hard Road: Restrung. The album was also nominated for 'Best Independent Release' and 'Best Cover Art' by John Engelhardt. The DVD City of Light was nominated as 'Best Music DVD' at the 2008 ARIA awards. At the 2009 ARIA Awards they won 'Best Urban Album' for a third time - for State of the Art and DJ Debris won an award for 'Engineer of the Year' for his work on that album. At the ARIA Music Awards of 2012, Hilltop Hoods won its fourth award in the 'Best Urban Album' category for Drinking from the Sun; as of November 2012, the group has won six awards from twenty nominations. At the 2012 ARIA Awards, established Aboriginal Australian band, Yothu Yindu, was inducted into the Hall of Fame. A photograph of Suffa holding the award in the presence of the band was posted on the Hilltop Hoods' Instagram profile, accompanied by the following comment: "A memory I'll take to the grave. Meeting Yothu Yindi and having them let me hold their Hall of Fame ARIA. What a beautiful induction." The band was nominated in three ARIA categories in 2014: Best Group, Best Urban Album and Engineer Of The Year. In an October 2014 radio interview, Smith said that the band does not expect to win an award, but wishes the best for the winners; however, the Best Urban Album award was given to the band on 26 November 2014, providing the band with their seventh ARIA award.
Question: Which awards were they nominated for?

Answer:
'Best Independent Release' and 'Best Cover Art'