Just watched the 1972 movie production of "1776". Personally I thought the movie was VERY entertaining. I'm not much into musicals and I thought for the most part the songs were forgetable.
That being said, the acting was top shelf and the story, well, is, inspiring. I'm no historian, but I believe it was reasonably historically accurate.
There were points in the movie when I was really moved... and when they signed the document of declaration at the end as the bell tolled, I got a tear in my eye.