I’ve had a few conversations recently about the principle that a performer should feel the emotions that the music they perform will evoke in their listeners. It’s a widely-promulgated view; I came across it recently in Joszef Gat’s Technique of Piano Playing, and a friend shared a quote from CPE Bach which I suspect might be one of the earlier examples, articulating what was then the new aesthetic of sensibility. It was readily absorbed into the Romantic tradition in formulations such as ETA Hoffman’s idea of music ‘speaking directly from the heart to the heart’, and, like much of that tradition has become pretty much a truism in general conceptions of musical performance today.
The principle articulates an aesthetic of authenticity, or honesty, in performance, the idea that the performer means what they are saying. It conceives of the act of performance as one of communication, as a transmission of meaning from one consciousness to others, and assumes that meaning is of a type that is personally engaging and generates mutual sympathy. If you have been involved in making or listening to music in the west in the 20th or 21st centuries, this will all sound sensible and very much what performance is about.