Noel Thomas David Gallagher is an English musician, singer and songwriter. Gallagher is the primary songwriter, lead guitarist and a co-lead vocalist of the rock band Oasis. After leaving Oasis, he formed Noel Gallagher's High Flying Birds.Noel Thomas David Gallagher is an English musician, singer and songwriter. Gallagher is the primary songwriter, lead guitarist and a co-lead vocalist of the rock band Oasis. After leaving Oasis, he formed Noel Gallagher's High Flying Birds.