Media monitoring using multiple types of signatures is disclosed. Example media monitoring methods disclosed herein include reporting media signatures of a first type to monitor media presented by a media device, the media signatures of the first type being generated by a device meter from a sensed signal. Disclosed example media monitoring methods also include, after receiving an indication that a first media signature of the first type is associated with first reference media, generating media signatures of a second type, different from the first type, from the sensed signal to continue monitoring the media presented by the media device. Disclosed example media monitoring methods further include, in response to detecting that a source of the media presented by the media device has changed, generating the media signatures of the first type to continue monitoring the media presented by the media device.