Abstract: In accordance with an embodiment, described herein are systems and methods for generation or selection of advertisement content or creatives (dynamic advertisements), in real-time, for use with a digital media content environment and media content streams. A media server enables streaming of media content to client media devices. An advertisement generation service can receive data or information describing, for example, a user profile associated with a user, to determine demographic data or information, and/or a metadata describing the media content played by the user within a current streaming session, and generate or select, in real-time, a dynamic advertisement for use with the streaming session. A dynamic advertisement can include a combination of background audio content (a background track), with voiceover audio content (a voiceover track), which is determined to be suitable in music style for playing within the current streaming session and/or to target the user's demographic data or information.