A target line detection device includes a processor configured to execute a process. Also, audio data corresponding to a musical score are output, in which the musical score is photographed, musical signs from the photographed musical score are extracted, a pitch of a tone is extracted from music paper and musical note information of the musical signs, a duration of the tone from the musical note information of the musical signs is extracted, and audio data are output. The frac fluid source is connected to supply a stream of frac fluid to the frac pressure pump.