I'll throw one more answer in here. The original was, in all likelihood, on some sort of record. If a semitone is 16:15, and the record was designed to be played at 33⅓ RPM, playing the record around 31.26 RPM would result in a semitone difference, plus the sound quality and tempo would likely change noticeably. Not even a whole semitone would be necessary to be disturbing to a listener with or without perfect pitch. Some instruments will sound different, particularly woodwinds that are no longer playing quite in the registers of the sounding pitches. The timbre will change, possibly to be more dull, and again, the tempo will be that much slower. So, there is more to this than pitch, and it's not "just OCD" by someone with absolute pitch.
I'll echo another answer, then, and say that if you can find the original album, just speed it up to the pitch you are expecting. It will be harder to accomplish the same effect in MP3. In .wav, you could simply speed up the bit rate slightly if you have software that will do so. The Nyquist frequency would not be an issue if playback will always be at this higher bit rate. If the recording must be translated back to a standard bit rate, then yes, a low-pass filter would be necessary, but it is unlikely that you would notice a loss of quality unless you are the type that somehow notices loss of quality when going from an analog format to CD.