Ah, but you want those resonance frequencies, or formants. Both for a particular sound color and also to cut through other sounds. The well known "singer's formant" centers around the highest F# on the piano. Opera singers train and train to punch up this harmonic across the actual range of sung notes. There is a hole in the sound frequencies of the entire orchestra that will allow the singer to be heard even while other "louder" instruments are playing.
Also the varnish may be as important as the source wood in trating the wood to get this evenness of density.