Because I am a natural mimic, I can impersonate you to help you hear the sounds you make and how you are moving your tongue, your lips, your jaw and so how your facial muscles are working when you speak.  This makes learning a new accent or mode of speaking very fast: whether it be simply softening your own regional sounds; learning another accent or dialect; Standard English; or Heightened Received Pronunciation (Posh English) or delivering a speech  singing a song,  or delivering a business presentation.