1948: Summer Songs

Summer is upon us, and what do you suppose the folks in 1948 were watching? By the looks of this lineup: musicals. Not just because four of the films below are musicals, but because two of them ended up among the highest-grossing films of the year - though, naturally, the two I prefer are neither of them.  Sprinkled among those songs of the summer: Charlie Chan (not a season goes by without him!), a lot of noirs, and the greatest crossover any Cinematic Universe ever thought to put out...