Respond to the question $38-3$ in Business Scenarios and Case Problems on page $880$ of the textbook.

Spotlight on Digital Music$$Price Fixing. Together, EMI, Sony BMG Music Entertainment, Universal Music Group Recordings, Inc., and Warner Music Group Corp. produced, licensed, and distributed $80$ percent of the digital music sold in the United States. The companies formed MusicNet to sell music to online services that sold the songs to consumers. MusicNet required all of the services to sell the songs at the same price and subject to the same restrictions. Digitization of music became cheaper, but MusicNet did not change its prices. Did MusicNet violate the antitrust laws? Explain. $[$Starr v$.$ Sony BMG Music Entertainment, $592$ F$\mathrm{.}3$d $314(2$d Cir. $2010)]($See Section $1$ of the Sherman Act.$)$