Who is Rachmaninov

Dear Ellepana, 

Sergei Vasilievich Rachmaninoff is the full name of the composer
Sergej Rachmaninoff/Rachmaninov. He was not only a composer, but also
a pianist and a conductor.

You can read more about him here: 

Sergei Rachmaninoff (Wikipedia)
<http://en.wikipedia.org/wiki/Sergey_Vasilyevich_Rachmaninov> 

I hope this answers your question. Please contact me if you need any
clarification on this answer before you rate it.

He is a well known Russian composer and pianist who lived at the turn
of the 20th century and beyond. He is well known for his piano
concertos

Perhaps these links will be helpful to you.

http://www.bbc.co.uk/music/profiles/rachmaninov.shtml

http://www.radix.net/~chinatom/rach.html