WHILE we mere mortals, after a busy concert season, are preparing to decamp to our country estates, lakeside villas or the secluded turrets of Castle Hame'll-Dae-Me, spare a thought for the troubadours of the BBC SSO who, after a season that culminated last week with a pulverising Rite Of Spring, have set aside the buckets and spades to climb on a plane today and fly off for a seven-concert tour of Holland and Belgium with conductor Ilan Volkov and four different programmes: that's a lot of air miles and even more notes.