The first site is called All Talking! All Singing! All Dancing! It's about the early talking pictures.
Here are are a couple of clips from the site. The first is from a movie called 'Chinese Fantasy.' It starred Rin Tin Tin and Myrna Loy.
Now here's a clip starring Alice White in Show Girl In Hollywood. They used to churn out the musicals. Now they're rare. I have to figure the cost/benefit ratio is off putting.
When I was a child I saw 'Giant,' 'Seven Brides for Seven Brothers,' 'How to Marry a Millionaire.' 'Friendly Persuasion,' and many other movies in drive-in theaters. From Another Old Movie Blog here is a mash up of some ads for drive-ins. Warning: your head might explode if you're in the habit of playing the race card.