The Wizard of Oz is to be given a fresh outing by the Royal Scottish National Orchestra for its new programme of populist shows.

The technicolour tale of Dorothy and Toto and their journey on the yellow brick road will be given the full orchestral treatment, with a show to coincide with the Glasgay festival as the RSNO strives to broaden its appeal.

In a further announcement, the orchestra will also present a night of music by John Williams, the composer of film scores such as Superman, Jaws and ET, with a session with folk singer Dougie MacLean also planned.

The 100th anniversary of the birth of composer Benjamin Britten and an expansion of the activity of the orchestra's principal guest conductor, Thomas Sondergard will also be celebrated in the programme for the 2013/14 season.

Both Edinburgh and Glasgow will see three more concerts each, reversing cuts made to the national company's programme the year before.

The orchestra's increased programme, with 20 concerts in Glasgow and Edinburgh – an increase of three – is not only based on its sound finances but also on the desire of its chief executive, Michael Elliott, to reach more of the country.

A new touring plan will also get under way, with shows scheduled for Inverness, Dunfermline, Langholm, Pitlochry and Arbroath.

In total, the chamber series of concerts is also increasing from three to four, the "pops" or populists shows are increasing from six to 11, and the regional touring gigs are six compared to none last year.

The season is the second under music director Peter Oundjian, whose first three concerts were sold out in Edinburgh and Glasgow.

Mr Elliott said: "We have been blessed with a tremendous start to Peter and Thomas's first RSNO seasons as part of the team.

"The last 12 months marked the start of a new era for this organisation, symbolised by the start of the construction of our new home in the centre of Glasgow.

"In the coming orchestral year we have a strong season, with more concerts in Edinburgh and Glasgow, a greater commitment to bringing live orchestral music at medium-sized venues across Scotland, increasing our presentation of cross-genre programmes to attract new audiences, and the continued forging of partnerships."

Mr Oundjian added: "I have been overwhelmed by the warmth with which both my and Thomas's arrival has been received.

"Speaking personally, in the short time I have been in post we have achieved a great deal; some fantastic performances in the concert halls across Scotland, exciting recording projects and a memorable tour of China.

"Going forward, I am proud to announce our ambitious new season, which I hope will appeal to our supportive and growing audiences."

Mr Oundjian's opening programme of his second RSNO Season features Gustav Holst's The Planets Suite paired with the UK premiere of James MacMillan's Piano Concerto No3 with soloist Jean-Yves Thibaudet.

In November he will conduct the Britten War Requiem, in the week of the composer's anniversary and in the 120th anniversary year of the birth of poet Wilfred Owen, whose poems are referenced in this major work.

Further programme highlights include Rachmaninov's Symphonic Dances, Walton's Symphony No1, Richard Strauss's Ein Heldenleben, Beethoven's Symphony No7 and Mahler's Symphony No 8, one of the largest-scale choral works involving an expanded orchestra as well as the RSNO Chorus and Junior Chorus.

On average concert-goers under the age of 26 now account for 13% of the audience, a 2% increase on the previous season.

The orchestra is also building a new headquarters in the centre of Glasgow next to the Glasgow Royal Concert Hall.