Unless you play one, it’s not every day that you get to see a theremin in action. It looks like black magic, an instrument you play without even touching it, waving your hands to produce mystical, swooping glissandos. It is literally conjuring sound from thin air. Fortunately, after Kalevi Aho’s concerto Eight Seasons, Carolina Eyck, the world’s leading theremin player, gave the Proms audience a debrief before her encore to explain how it was all done. I hope she doesn’t get expelled from the Theremin Magic Circle for revealing its secrets.
Between its two antennae are electromagnetic fields. The left hand controls the volume – the closer to the antenna, the softer the sound – and the right hand controls pitch, a flutter of the fingers producing a vibrato. Eyck’s expressive hands wove their patterns to mesmerise in Aho’s concerto, written for her in 2011, commissioned by the Lapland Chamber Orchestra. The premiere was conducted by John Storgårds, also at the helm here, this time with the BBC Philharmonic.
The concerto is rooted in the north, the seasons being eight in number because the Sámi people divide their year into eight sections. Aho’s music creates a spare, bleak atmosphere, not unlike that of his teacher, Einojuhani Rautavaara. Indeed, there were times when the theremin’s plunging response to the oboe’s keening bird calls reminded me of Rautavaara’s Cantus Arcticus. Eyck would seem to pluck the air to create a double bass pizzicato thud, or glide her hands as if playing a harp glissando. There were moments where she sang too, melismas in duet with her theremin.
At 33 minutes, there were occasional longueurs – four seasons rather than eight would have been sufficient. Likewise, Kaija Saariaho’s Vista, which was also receiving its Proms premiere. Written for large orchestral forces, but without her signature palette of piano, celesta and harp, it was inspired by the views the composer experienced driving from Los Angeles to San Diego. It is in two chunky movements, Horizons and Targets, sounding bold and energetic in its noisier moments, but tension sagged in the middle.