At his 1974 “Main Event” concert at Madison Square Garden, Frank Sinatra made a memorable entrance that was introduced by sportscaster Howard Cosell. Cosell’s introduction set the stage, saying: “Live, from New York, the city whose landmarks are famous all over the world… And in the heart of the metropolis, the great arena: Madison Square Garden, which has created and housed so many champions, and which is why tonight from the Garden the most enduring champion of them all, Frank Sinatra, comes t