Abstract: Using data generated by a sensor, a current value of a metric representative of a physiological state of a user of a digital content playback device can be determined. This metric can be compared to a set of predefined target ranges, and a tempo increase factor can be selected based on a range within the set of predefined target ranges to which the metric corresponds. The tempo increase factor can be applied to adjust a current playback tempo of music provided by the digital content playback device to the user. Methods, systems, articles of manufacture, and the like capable of implementing such features are described.

Abstract: Sensor data generated by one or more sensors associated with a digital content playback device can be used to identify that a modification to a current audio content item being supplied to a user by the digital content playback device is indicated. The current audio content item can be modified accordingly. Methods, systems, articles of manufacture and the like are also described.