rockstar (plural rockstars)

1. A famous and successful singer or performer of rock music. (Not quite, but I have performed with a few bands in my life…more on this later)
2. (figuratively, sometimes used attributively) A person who is renowned or revered in his or her field of accomplishment. (Better)
3. A person who always delivers the goods. If they say they are going to do something, they do. Rockstars tend to downplay their success and multiple talents and don’t like the attention. They simply deliver consistent results. (Best)