Unfortunately, there's not that much info on Larry/Laura, but I'll share what I know.

This is basically a "Dinner is served" part. The original actor was about the only one involved who didn't want his part expanded. The character is based, in part, on Bob Avian, Michael Bennett's co choreographer or Asst Choreographer.

The two men had differing styles of expertise as well as complementary personalities. For example, Michael might do something that would upset everyone. After everyone scattered, Bob would reconcile the parties involved. Michael was a strong leader, whereas Bob was not really interested in leading, but really enjoyed assisting. In terms of dance style, Michael was more of a jazzy, low dancer, whereas Bob was more into ballet as well as popular styles. In addition, Michael had more of an "editor's" eye, looking at the patterns and overall scheme. Michael trusted Bob's input, however, and he would choreograph something, ask Bob what he thought, and then work from there. Of course, none of this is really "act"able, but it does give you some background on their relationship.

As for how Larry is usually played, he is usually pretty no-nonsense and authoritative. Assistants to directors such as Zach tend to bring a personal touch to the proceedings, but run the rehearsal in the style of their leader so that the leader can watch what he would normally be doing himself. In this case, the part with the most acting involved is the Tap Combination. I would just try to communicate a sense of purpose, even though you don't have a lot of lines.

Larry does know quite a few of the performers. He is good friends with Connie, as she has often assisted Zach before. He would also know Cassie, Sheila, Bobby, Diana, Don, Mike, and Judy. He might know Richie, Val. With the exceptions of Connie and Cassie (whom he'd like),it's up to you to decide who you like. He might reach out to a newcomer where he might not to someone he thinks has too much attitude, like Sheila or Bobby or Greg. This can be used in the Tap scene as well. For example, he might be teasing Connie while he's berating Sheila. However, all these people are pretty likeable, and Larry is an easy-going guy.

Just to give you some personal background on Larry, the original actor to portray the role, Clive Clerk, had been a Broadway dancer early in his career. He left for California and had a successful career in film. Eventually he became bored, however, and he decided to leave the industry. In fact, he was pursuing his degree in art when he returned to New York. Bob Avian was an old friend who had a wonderful time, and eventually returned to finish his art degree with great memories of the show. So, between the stories of Bob Avian, Clive Clerk, and Tony Stevens, pick and choose a background story.

Originally, Larry wore a black tank top (with a 17 on it) and dance pants. He is supposed to be very sleek. Just try to find small moments to express personality through reactions. Also, have lots of fun in the Montage. That is where he bonds with the auditioners in their similar trials of adolesence.