Flowering trees and bushes

Spring is about things turning green but it's also about the "flower show" from trees and bushes.
Just catching up on what I've been seeing in the neighborhood.  Our small lilac bush is likely a year from blooming but it is trying.

I think these are crabapple trees based on what's planted in the neighborhood but this "sleeve" of flowers has me questioning if maybe some type of cherry tree?

A spring favorite - lilacs

 

 

And this little flower is part of the mustard family.  Known by many names including yellow rocketcress.  This is just beyond our fence and caught my eye enough not to mow over it...