This plant stands about 3 1/2 to 4 foot tall. Anyone know what it is?

Melilotus alba, I think.

Thank y'all I thought it looked like some kind of clover until it got so tall & bloomed I'd never seen that kind before

Not a good plant to have around, IMO. It's quite invasive, and I've seen it wreak havoc in wild prairies in MN, IA and SD. Even though it is a biennial and attracts pollinators, it's very aggressive and displaces natives and native plants for pollinators.

for the heads up, Rick I had planned on doing some research on it but have been so busy! I didn't see anything negative about it in the database & a lot of people seem to have it