'Clap' & 'Charli XCX' look like they're something in the Pistili family but it doesn't quite match.

Caslon 540  Suggested by jerseygirl 
Normande  Suggested by jerseygirl 

Thanks! Anyone know 'Boom' and 'by'?

Thank you so much again!

Wait I just looked at both of the fonts & they're not right! :(

Edit: OK I think I found the "clap", "charli xcx" font. It looks very similar to Bodini Poster Italic. I think it's customized though because 'x's look a little different.