Style

Elvis used vibrato in every song.  He couldn’t do those slow songs with excellent vibrato without vocalizing practice.

They Remind Me Too Much of Youl by Elvis 

Today Tomorrow and Forever by Elvis 

Farther Along by Elvis

Vibrato takes 60% more breath to sing. Audiences are soothed by vibrato.  Imagine you are soothing the audience while you sing vibrato.

Dynamics

VOLUME LEVELS IN A SONG – LEVELS 1 TO 10 Very Important!!! — This is expression. This is the Pro level. Audiences expect changes in volume so the song doesn’t sound boring. Songs verses, portions of a verse, or even individual words are sung at different volumes.