The author decided not to use IPC as a distributor for their new music magazine because IPC already distributes a similar magazine called NME that targets the same audience. Distributing through IPC would result in direct competition with NME that could prevent the new magazine from being successful. Instead, the author chose Hearst Magazines UK because they do not currently distribute any music magazines so there would be no direct competition. Hearst also distributes popular magazines like Esquire and Company that could help attract a wider audience and increase the success of the new music magazine.