Two thousand voices, one song - it must be some kind of record. It certainly is in one sense, says Stuart Clyde, depute head at Alva Academy in Clackmannanshire: “We released the CD single at the start of the week and we’ll find out tomorrow if it’s made the charts. We’re hopeful. A quarter of a million people have heard the song on Radio Scotland, and we had lots of pre-launch orders.”

Penned by songwriting duo Clifford and Clyde (David Clifford being Alva Academy’s principal teacher of music), The Haggis is “a cheeky, catchy song with a silly dance - think Agadoo with a kilt.”

While it won’t profit financially (all proceeds go to Comic Relief), the benefits to Alva Academy and its associated primaries have been immense, he says. “We went out with a digital recording workstation to the six primaries and got all the kids singing. We recorded three assembly hallfuls of pupils. We took those nine audio files to the BBC studios and edited and mixed them into the final single. So it has over 2,000 enthusiastic voices on it, from four-year-olds right to sixth-year.”

Alva Academy is well equipped for music projects, says Mr Clyde, but being this year’s Radio Scotland SoundTown school gave them access also to superb facilities and expertise. “That has been fantastic, with our kids or teachers on the radio every few days, commenting on anything from sex education to helium balloons. We’ve had broadcasts from the school, workshops and visits to the BBC studios.”

Mr Clyde hopes to keep the momentum going when the BBC moves on, by setting up a school radio station. “It has been the most intensive project I’ve been involved in. But would I do it all again? In a heartbeat.”

Watch The Haggis video at www.bbc.co.ukprogrammesb00j1b92; download the single at iTunes or Napster; or buy it at HMV in Stirling, where pupils perform live tomorrow afternoon.