A method and apparatus for marketing an un-owned composition to a user and acquiring an un-owned composition for a user's collection of compositions. A customized sequence of compositions is generated for a user. The customized sequence may be based upon the user's history or other compositions familiar to the user or other compositions in the user's collection. Portions of one or more compositions that are un-owned by the user may be interleaved for free and/or for multiple times in the sequence, in-order to interest the user in acquiring the composition. While an un-owned composition is active or playing, the user may take action to acquire the composition or add the composition to the user's collection. Usage-rights for an acquired composition may be stored at a network repository and may be automatically usable at one or more user-devices, whenever the user is active at such a user-device.