thanks for chiming in! the quick answer, is "suno doesn't own your piano part that you the human played into suno". the reason for that, as mentioned in the TOS, is that we expect that you are the owner or have exclusive rights to use the material you input into suno. the real long form legal version of that from the TOS is as follows:
"You represent and warrant that you own all right, title and interest in and to Submissions, including all copyrights and rights of publicity contained therein, and that you possess all necessary rights or have obtained all consents necessary to grant Suno the rights and licenses herein. By using the Service or otherwise transmitting Submissions to us, you grant to Suno and our affiliates, successors, assigns, and designees a worldwide, non-exclusive, fully paid-up, sublicensable (directly and indirectly through multiple tiers), assignable, royalty-free, perpetual, irrevocable right and license to use, reproduce, store, modify, distribute, create derivative works based on, perform, display, communicate, transmit and otherwise make available any and all Content (in whole or in part) in any media now known or hereafter developed, in connection with the provision, use, monetization, promotion, marketing, and improvement of our products and services, including the Service and the artificial intelligence and machine learning models related to the Service."