* Nostalgia: "Brown Eyed Girl" is one of Morrison's most popular and well-known songs, and it has been a staple of his live performances for many years. It is a song that many of his fans know and love, and it can be a nostalgic experience for both the artist and the audience to sing it together.
* Audience engagement: "Brown Eyed Girl" is a catchy and upbeat song that encourages audience participation. The repetitive chorus, with its simple lyrics and sing-along melody, makes it easy for the audience to join in. This can create a positive and energetic atmosphere at Morrison's concerts, and it can help connect him with his fans.
* Personal significance: "Brown Eyed Girl" was inspired by Morrison's girlfriend at the time, and it may hold special personal significance for him. Performing the song in concert could be a way for Morrison to express his feelings about his past relationships or simply to relive happy memories.
* Request from fans: Morrison's fans often request "Brown Eyed Girl" at his concerts, and he may simply be fulfilling their wishes by performing it.
Ultimately, Van Morrison's decision to sing "Brown Eyed Girl" in concert is likely a combination of these and other factors. It is a well-loved song that engages the audience and has personal significance for the artist. By performing it, Morrison can connect with his fans and create a memorable concert experience.