To hear singing in a dream is to link with the self-expression we all have. We are in touch with the flowing, feeling side of ourselves and of others.
To be singing is to be expressing our joy and love of life and our need to perform and star in our own show.
To be in a choir suggests our ability to worship or express ourselves in a peer group.
To be singing a football anthem creates a fellow feeling.
To find ourselves singing in a talent contest suggests that we wish for other people to become aware of our perceived abilities.