"The day Tarzan opened in London, I sat in a hotel room and discussed the project in detail"

This quote by Phil Collins is most likely referring to the 1999 musical adjustment of Tarzan, which he wrote the music for. It is likely that he remained in London for the opening night of the show, and was talking about the project with someone in a hotel space. This could have been a colleague, a producer, or somebody else associated with the production. It is most likely that they were talking about the success of the program, and the impact it had on the audience. It is also possible that they were discussing the future of the program, and what modifications could be made to make it even better. This quote reveals the devotion and passion that Phil Collins had for the task, and his dedication to making it the best it could be.