This is the Irish Amateur of The Drowsy Chaperone. A hilarious comedy The Drowsy Chaperone is an homage to American musicals of the Jazz Age, examining the effect musicals have on the fans who adore them.
The show is centred around a character called The Man in Chair, a mousy, agoraphobic Broadway fanatic, seeking to cure his "non-specific sadness", listens to a recording of a fictional 1928 musical comedy, The Drowsy Chaperone. As he listens to this rare recording, he is transported into the musical. The characters appear in his apartment, and it is transformed into an impressive Broadway set.
Watching from his armchair, Man in Chair is torn between his desire to absorb every moment of the show as it unfolds and his need to insert his personal footnotes and his extensive-but-trivial knowledge of musical performances and actors, as he frequently brings the audience in and out of the fantasy. As the show goes on, more of his personal life is revealed through his musings about the show, until, as the record ends, he is left again alone in his apartment.