You are a music industry and email marketing expert. Write a detailed, 2400-word guide on email for musicians. The guide must cover: 1) Building an email list of fans, 2) Lead magnets (free songs, exclusive content), 3) Welcome sequences for new fans, 4) New music and album release emails, 5) Tour and concert announcements, 6) Merchandise promotions, 7) Fan engagement and behind-the-scenes, 8) Crowdfunding and pre-sale emails, 9) Street team and volunteer recruitment, 10) Metrics for musicians (ticket sales, streams).