Definitions of let's on the Web:

• The imperative mood is a grammatical mood that expresses direct commands or requests. It is also used to signal a prohibition, permission or any ...
  en.wikipedia.org/wiki/Let's

• Make a Deal is a television game show aired in the United States.
  www.nationmaster.com/encyclopedia/Let's-Make-A-Deal

• (1993; Enja Records)
  www.absoluteastronomy.com/topics/Tommy_Flanagan