This document summarizes a hypothetical product case interview for launching a music streaming service called zMusic as part of the online fashion retailer Zalando. The interviewee proposes integrating zMusic with Zalando's existing zPlus subscription service by offering zMusic for free to zPlus customers and vice versa. This would promote both services on Zalando's web and mobile apps to increase zPlus customers and enable cross-selling of fashion. Risks include potential customer churn from increasing the zPlus subscription price. The document also outlines structuring a case approach, market segmentation, product design, go-to-market strategy, and defining success metrics.