This corpus contains voice recordings of 24 Spanish male speakers: 12 pairs of monozygotic (MZ) twins. They belong to a larger corpus collected by Dr. Eugenia San Segundo Fernández for her Doctoral Dissertation (more info: https://eugeniasansegundo.github.io/). You will find two folders: 1) Complete_Reading_Task contains the reading task of each speaker as it was originally recorded. You may therefore find ringtones at the beginning, introductory words by the speaker, interruptions or text repetitions. - Each speaker reads two phonetically-balanced texts in Spanish. - The participants were also instructed to read one of the texts while pinching his nose (voice disguise). They did this after having first read the two texts in an undisguised way. - They were recorded in two different sessions (time lapse: 2-3 weeks) doing exactly the same reading task. 2) Single_Text_Reading is an edited version (shortened) of the original recording: it only contains the reading of the first text in undisguised style. You will only find one recording session per speaker. ***The corpus has been shared in Zenodo Repository using a Creative Commons Attribution-NonCommercial-NoDerivatives licence (CC BY-NC-ND).