Advanced MP3 Organizer & Minimal Mixer for Collectors

The user is looking for a very specific type of MP3 player/mixer: 'basic mixer without all the DJ junk' that 'Supports folders hierarchically' and does NOT 'find the music' automatically. This highlights a niche for meticulous music collectors or hobbyists who want precise, manual control over their vast local music libraries, rather than relying on bloated software or cloud services. A SaaS (or hybrid desktop app with SaaS features for sync/backup) could offer robust, manual library management, hierarchical folder support, powerful tag editing, simple mixing/crossfading functionalities, and multi-device sync for user-controlled libraries. Expected Revenue: A niche subscription model ($5-$15 per month) for power users who value control and organization over their music, or a one-time purchase with optional cloud-sync subscription. Potential for $5k-$20k+ MRR as a specialized tool.