Unaccompanied singing is all about breathing (I am sure some realise this) using normal speaking phrasing and of course odd spoken word and stops etc ~ accompaniments using instruments (yea what else?)

This is at odds from accompaniments which tends to want to impose a straighter rythmical delivery ~ as Sandman says ~ accompaniments should be just that and and it is imortant not to impose and change the most important part ~ the delivery of the song storyline ~ that is get in the way!

Accompanists CAN of course on occasion ADD to the overall delivery of the song and convey an artistically pleasing "package" to the hearers

Ray