I love Lady Gaga.
She's good, her album topped the US Charts and sold more than one million copies in its first week. 
That is not surprising at all.
No it's not, and she studied at CAP21 but ended up dropping out to become a professional musician?
That was obviously a good decision on her part.
She obviously didn't need to stay there or she might be stuck doing Off- Broadway productions that they train for. 
I cannot imagine her on broadway.
Broadway theatre
Broadway theatre, also known simply as Broadway, refers to the theatrical performances presented in the 41 professional theatres, each with 500 or more seats located in the Theater District and Lincoln Center along Broadway, in Midtown Manhattan, New York City. Along with London's West End theatre, Broadway theatre is widely considered to represent the highest level of commercial theatre in the English-speaking world.
The Theater District is a popular tourist attraction in New York City. According to The Broadway League, for the 2018–2019
US, and has sold more than 7 million worldwide. It produced five consecutive singles in the top five of the Adult Top 40 radio charts; three of these, "It's Not Over", "Home", and "Over You" have each sold over 1 or more million copies in the US.
The second album, "Leave This Town", reached No. 1 on its debut week and sold 269,000 units in its first week. It has since sold over a million copies in the US