What is the fine-grained topic of the following text: At various times he has been a member of Bishop Grosseteste College Choir and Musical Director of Skegness Arts Group, Skegness Choral Society, Boston Operatic Society and for the past 10 years of Skegness Musical Theatre Company, where productions of The Scarlet Pimpernel and Sweeney Todd were among the highlights. Only return the topic.
The individual's involvement in various music and theatre groups.