Lauri Porra is bassist in the Finnish heavy metal band, Stratovarius (2.5 million worldwide sales).
His grandma’s father was Jean Sibelius (spot the likeness?)
So for the Sibelius 150 year, Lauri has given up the metal and written a concerto for electric bass and symphony orchestra.
You can watch it here. Worth it, to see a Sibelius plucking those strings.