Offer specialized services for producing music specifically for audiobooks and podcasts. This can include background scores, theme music, and sound design. The business would provide packages tailored to different needs, such as long-form background music for narrative audiobooks or short, catchy intros for podcasts. Advanced options could include custom sound libraries and subscription plans for frequent customers.

Start an agency aimed at connecting musicians with brands for sponsorship and influencer marketing campaigns. This would involve creating a database of musicians with various types of followings and niches, developing marketing strategies, and facilitating the campaign execution, including content creation and analytics tracking.

Design a VR application where musicians can create and collaborate in a virtual music studio environment. This would include digital instruments and tools that mimic real-world studio equipment. Collaboration features would allow multiple users from different locations to work together in real-time. Advanced options might include integrations with physical MIDI instruments and export options to traditional DAW (Digital Audio Workstation) software.

Offer a service connecting songwriters with artists and producers in need of original songs, and facilitating the licensing of music for various media such as films, commercials, and video games. The platform would need robust legal tools for copyright management and contract creation. An advanced feature could include analytics to track song performance and royalty earnings.

Establish an online marketplace specifically designed for musicians to buy and sell music-related merchandise and equipment. This could include second-hand instruments, custom merchandise like band t-shirts, and even digital products such as sound samples and loops. Advanced options might offer escrow services for high-value transactions, seller ratings, and insurance options.

Create a platform where musicians can perform live, streaming their concerts to a global audience. The platform should have features such as ticket sales, interactive chat, fan tipping, and merchandise sales integration. Premium features could include VR/AR concert experiences, high-quality audio streaming, and multi-camera setups for a more immersive experience.

Develop a mobile application designed to help musicians track their practice routines, set goals, and monitor progress over time. Features could include a library of practice exercises, a timer, and the ability to log practice sessions. Advanced versions might offer integration with wearable tech to track physiological metrics or embedded AI for personalized practice recommendations.

Build a social network tailored for musicians to find collaborators, whether for studio recordings, live performances, or songwriting. Features could include profile-building with portfolio showcases, messaging and video chat tools, and project management tools to track progress. Monetization options could include premium subscriptions for enhanced features like exclusive networking events and masterclass access.

Create a service where musicians can offer custom music compositions for various needs - from individual consumers looking for unique wedding songs to businesses seeking tailored jingles for advertising. This would involve a collaborative platform where clients can describe their needs, choose from different genres, and have iterative feedback sessions until the final product is delivered. Advanced features might include licensing options and usage analytics.

Develop a web platform where musicians can offer real-time online lessons. This can include one-on-one teaching sessions, group classes, and even pre-recorded video tutorials. Integration with popular video conferencing tools, scheduling software, and secure payment gateways are essential features to consider. An advanced option could include AI-driven practice recommendations and feedback systems.