accompanists hold the keys
Accompanists are the unobtrusive support behind the soloist. They are able to lead as well as to follow and perform music that is as demanding as that of a soloist. Yet, they rarely recieve the same adulation and recogntion.
Tom Service of The Guardian writes: http://www.guardian.co.uk/music/tomserviceblog/2012/mar/04/accompanists-unsung-heroes-music