“Finnish tango” are two words that you might not expect to see together, yet here we were on a Monday night in the Concertgebouw, listening to exactly that. Violinist Pekka Kuusisto was joined by Iiro Rantala in the third concert of his Robeco Zomerconcerten residency and together they delivered a high-energy performance that found itself somewhere in between jazz, tango and classical music.