Innes is a product of the Feis movement and has had a professional career playing the accordion since 2003.
In 2005 he recorded his debut solo album How's the Craic? on Skipinnish Records.
Innes plays a mixture of festivals, concerts, and corporate functions, from royalty, grand theatre's, to small local sessions with his fellow highland musicians. His distinctive purple accordion and himself have traveled and performed in quite literally the four corners of the globe.
He joined Runrig on stage at their concert Beat the Drum in Drumnadrochit on 18 August 2007 where he played to an audience of 17,500 and has continued to join the band at many of their open air shows with 'clash of the ash
In 2010, Innes formed Mànran who hoped to become the first band since Runrig to enter a Scottish Gaelic song into the UK Top 40 when they released their first single, 'Latha Math' on 17 January 2011. It fell short finishing the week in 61st place, however they managed No1 in the UK singer/songwriter charts, No6 in the Scottish Charts, and No6 in the Radio 1 Indie Charts.
Innes alongside his bandmates Mànran and Pop Idol winner Michelle McManus created the official 2012 STV Appeal charity single "Take You There" and performed it live on the show which raised two million pounds for under privileged children in Scotland.
Innes was musical director of the BBC ALBA Hogmanay show, 2011, 2012, 2013.
In 2015 Innes created Scotland's first collaborative charity folk single with a piece of music he composed called 'Our Heroes' This was to commemorate the 100th anniversary of WW1 Battle of Festubert by recording the very bagpipes that 'Lance Corporal Donald Patterson' fell playing on 18 May 1915, 100 years to the very day, with all proceeds being donated to Scotland's veteran charity Erskine
Innes started playing shinty at a young age, playing for local side Lochaber. When their youth team folded, he moved to Fort William Shinty Club, where he developed into one of the leading players of the 2000s. He was typically to be found playing at wing forward.
He was captain and man of the match for their famous victory in the 2005 Camanachd Cup final over local rivals Kilmallie and the club's historic league championship in 2006.
He has also appeared fourteen times in the Composite Rules Shinty/Hurling International for Scotland. For the 2009 Shinty/Hurling International, Innes was named 'captain' of the Scotland team. Ireland's All Star Tommy Walsh broke Innes' nose in the first few minutes of the International in Croke Park however Innes continued and scored 7points for Scotland eventually beating the Irish 22-21.
He has reached iconic status in the game of shinty, an image of him playing the sport being used by Runrig on the cover of their 2007 album, Everything You See.
In 2010 Innes was named Marine Harvest and National 'Player of the Year' and for his shinty and musical talent was invited to the Queen's garden party in Holyrood.
Transworld Sport filmed a programme on Innes which was broadcast in 2010.
Innes double career as a high-profile shinty player and musician has resulted in a lot of attention. In March 2009 Innes claimed that he knew a rival team had deliberately targeted him for injury due to his musical prowess.
On 15 May 2010 in a game against Premier Division strugglers GMA, Innes scored 9 goals in a 14-0 victory. Innes claimed he was denied a record 10 by the referee not noticing a ball coming off the back stanchion. This would have given him the record for most goals scored in one single game.
On 18 September 2010, Innes scored 2 out of 3 Fort's goals against Kingussie in the 103rd Camanachd Cup final at Bught Park in Inverness. The win against Kingussie put the team's name on the trophy for the 4th year running. Innes' performance also claimed the Albert Smith Medal for the second time, having won it in 2005.
Innes retired on a high at the end of the 2014 season, restoring Fort William to the Premier Division and earning his final cap for Scotland. This was due to increased musical commitments.
Innes' high-profile has given him many opportunities to work with the media within music and sport.
From the start of the 2010 season, Innes wrote a weekly blog for bbc.co.uk and is often involved in summarizing for the BBC in front of the camera, or from the commentary box, unless he himself is playing.
- How's the Craic? (2005)
- Era (2017)
With Box Club
- Box Club (2008)
With Ewan Robertson
- Shouts (2009)
- "Daily Record & Sunday Mail - Scottish News, Sport, Politics and Celeb gossip".
- "BBC News - Shinty captain aims to be in charts 'alongside Rihanna'" – via www.bbc.co.uk.
- English, Paul (27 August 2012). "Michelle McManus admits writer's block nearly ended her hopes of charity single for STV Appeal".
- "BBC SPORT - Other sport... - Shinty star shrugs off threats".
- "Fort William's Innes nets nine, claims ten".
- "BBC Sport - Fort William 3-2 Kingussie".
- "Shinty: Late Innes winner caps thrilling final triumph for Fort William".
- "Gary Innes: Fort William star bids farewell to shinty". 12 November 2014 – via www.bbc.co.uk.
- "BBC Sport - Innes limbers up for start of shinty season".
- "Broadcaster Robbie Shepherd leaving Take the Floor after 35 years".