I would think that a shandy in America would be quite different to here. Schweppes bitter lemon or Sprite would be much more lemony. Bar lemonade, on tap is mainly chemical, think sweetened soda water with the merest hint of lemon, so all it does is dilute and sweeten the drink. I've seen bitter shandy, lager shandy but never Black and Tan shandy - maybe I haven't lived!

They sell/used to sell shandy in cans for children/non-drinkers but it just tastes of sweet brown chemicals.

When I was growing up some people used to drink lager and blackcurrant. It was difficult to get as bartenders used to say that it made people think that the beer had gone off!