 24, K. 491), but in practice pianists, if only to finish playing at the end, sometimes accompany.As far as modern practice goes, the matter is complicated by the very different instrumentation of today.The early fortepianos produced a more "orchestral" sound that blended easily into the orchestral background, so that discreet continuo playing could have the effect of strengthening the sonic output of the orchestra without (in effect) destroying the ritornello structure that is the basis for the Mozart piano concerto.