The systems intended to evaluate absolute pitch (AP) display a high variability regarding their configuration, which could be attributed to the complex definition of the concept. Also, studies delving into the effects that AP produces in music activities are rare, and usually with contradictory results. The current study is aimed to inquire into the AP evaluation systems and the self-perception of a group composed of 23 professional-grade music students with such profile to understand (a) the intensity of the practice of different music activities (memorization, improvisation, sight-reading, transposition, intonation, intervals identification and dictation), (b) the behavior of their musical hearing when performing them and (c) the influence that AP exerts over the performance of the aforementioned activities. In a previous study students undertook an AP test to classify them (partial, s...