Cornet/Trumpet playing:

Here's [Dipper Mouth Blues](https://www.youtube.com/watch?v=PwpriGltf9g&pp=ygUaIkRpcHBlc...) from 1923 by King Oliver. Note how how every part is really "interlocked" together.

Here's [West End Blues](https://www.youtube.com/watch?v=4WPCBieSESI&pp=ygUVIldlc3QgR...) from 1928 by Armstrong. Each instrumentalist is showing a _lot_ more technicality in their solos, and the solos are much longer and more isolated. That's one of the big keys -- instrumentalists soloing on their own while the band backs them.

Jazz singing:

Here's Al Jolson in 1922 doing [Toot, Toot, Tootsie!](https://www.youtube.com/watch?v=rlv4b9UCk0c&pp=ygUOQWwgSm9sc...). It's very vaudeville, very Broadway.

Then here's Armstrong in 1926 doing [Heebie Jeebies](https://www.youtube.com/watch?v=qEBMXJwQhNU&pp=ygUTSGVlYmllI...). It's much more personal, charismatic, and swinging. He's using some scatting!

Improv style:

1917 [Livery Stable Blues](https://www.youtube.com/watch?v=5WojNaU4-kI&pp=ygUYTGl2ZXJ5I...)

1927 [Potato Head Blues](https://www.youtube.com/watch?v=AeBn_TZ4Iak&pp=ygUmcG90YXRvI...)

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Now let's go forward 20 years to Dizzy Gillespie [Salt Peanuts](https://www.youtube.com/watch?v=gg1Wl-NmzWg&pp=ygUhZGl6enkgZ...). I think it's clear how Louie inspired _so much_ of what Gillespie and the orchestra are doing here. That would go on to morph so many ways over the next 60 years.

Hope that helps. I'm no expert -- just a guy who went to school for music and played trumpet, listened to a lot of Armstrong.