The present disclosure provides a wearable computing device. The wearable computing device may include a control system configured to perform functions. The functions may include receiving sensor data from one or more sensors of the wearable computing device. The functions may also include determining whether the sensor data is indicative of humming, singing, or whistling by a wearer. The functions may also include causing the wearable computing device to perform a content recognition of audio content in an ambient environment of the wearable computing device in response to the sensor data being indicative of humming, singing, or whistling by the wearer.