How do I act on stage, how in the studio? Two completely different situations that demand a lot of different things. In recording situations, minimalist behavior and concentration on the essentials determine whether studio time is used optimally or wasted. On stage, on the other hand, "great cinema" is the order of the day. The song or aria, together with the charismatic presence of the performer, form a complete work of art. Convince on stage and in the studio by acting adequately in each case and thus focus your creative energy on the best possible personal performance. 
The phrase: "I've done that better" can be a thing of the past.