Generally it's harder for a bass singer to control his voice and you will hear many of them sing off-key at times. It has something to do with the anatomical features of the voicebox that create the deep tone.

But Chris West knows how to do it right. Here is a fascinating little vignette in which he talks about voice placement in a serious, though humorous way. There is far more to this than average listeners realize. Click the link below. After you view it, go back and re-watch Chris in action on stage to see how he implements his techniques.