The correct answer is option 'C', E.T Paul.

E.T Paul, also known as Ernest Theodore Paul, was a British music publisher and producer who produced a popular music book with a picture on the cover page announcing the Dawn of the Century.

E.T Paul's contribution to the music industry:
- E.T Paul was a prominent figure in the music industry during the late 19th and early 20th centuries. He was involved in music publishing and production, and his work played a significant role in shaping the music scene of his time.
- He founded the music publishing firm E.T Paul & Co. Ltd., which operated in London. The company was known for producing and distributing sheet music, books, and other musical materials.
- E.T Paul was particularly interested in promoting popular music and making it accessible to the masses. He published numerous songbooks and music collections that featured the popular songs of the time.
- One of his notable works was a music book that had a picture on the cover page announcing the Dawn of the Century. This book likely showcased the popular songs and trends of the early 1900s, capturing the excitement and anticipation of a new era.
- The cover page with the picture announcing the Dawn of the Century would have been visually appealing and attention-grabbing, attracting readers and potential buyers of the book.
- E.T Paul's efforts in promoting popular music helped popularize and disseminate the music of the time. His publications provided a means for people to enjoy and engage with the latest songs and musical trends.

In conclusion, E.T Paul was a British music publisher and producer who produced a popular music book with a picture on the cover page announcing the Dawn of the Century. His contributions to the music industry included publishing and distributing sheet music, books, and other musical materials, with a focus on promoting popular music and making it accessible to the masses.