music trivia: piano players

With Alicia, most people know she is a piano player and would, maybe too easily guess that she plays on almost all of her tracks. With Bruno Mars, it's hard to find the data; yes he sometimes plays keyboards, but he does work with other keyboard players too, and I can't find a way to determine who is playing on any given track. I think this is common with a lot of newer pop acts, where there are so many cooks in the kitchen, it's difficult to say the contribution of each individual musician. Thanks for the input, and thanks for giving it a try.