 He referenced a classical of opera singer Elizabeth Billington, a well-acclaimed soprano with a strong voice who could only reach a small audience and naturally did not have access to a microphone or amplifier in 1798, let alone "MTV, CDs, iTunes, and Pandora".This limited her ability to dominate the market in the way that artists to do today.Marshall wrote, "So long as the number of persons who can be reached by a human voice is strictly limited, it is not very likely that any singer will make an advance on the £10,000 said to have been earned in a season by Mrs. Billington at the beginning of the last century, nearly as great [an increase] as that which the business leaders of the present generation have made on those of the last."