I've been told that up to 95% of wood furniture is coated with lacquer paint, I did some work in the wood furniture polish portion of Meguiar's before the products were discontinued, actually, I wrote the label copy and the how-to book for
Henredon Furniture products,
Ethan-Allen Furniture products and
Gibson Musical Instruments and in the process learned a little bit about the furniture manufacturing industry.
Since most furniture is
"finished", (that's the furniture industry's way of saying,
"painted", but don't ever tell the President of Henredon or Ethan-Allen their furniture is "painted"), you can use a light polish by hand or machine on any finished piece of furniture with a foam pad and you should get very good results as lacquer is
very soft.
The paint on
factory built furniture is very
thin, so be very careful around hard lines, edges and corners.
Suggestions
Pinnacle Advanced Finishing Polish
Wolfgang Finishing Glaze
M09 Swirl Remover 2.0
M205 Ultra Finishing Polish
Any light Menzerna Polish
Should all work well. Most light cleaner/waxes should work well also.
Be sure to test in an inconspicuous area first before buffing out the top of your black Grand Piano... make sure your product, pad and process, (process is how you use the pad and product), will make one small area look good before tackling the entire project.