"That said, I'd love to do a musical, either in film or on stage"

Reese Witherspoon is sharing her wish to tackle a musical task, either in movie or on stage. This can suggest that she is interested in either acting in a music movie or doing in a musical on phase. It is most likely that she is enthusiastic regarding musicals and also wishes to discover the style even more. She might have currently had some experience in musicals, or she might be looking to obtain experience in the field. Whatever the case, it is clear that she aspires to take on a musical task and also is open to either a movie or phase production. Her interest for musicals is evident in her quote and it is most likely that she will seek a music project in the future.