You don’t immediately think of Adolf Hitler when you are studying German and are looking for someone to model yourself on. Every recording shows the man speaking in strident and hysterical tones. All but one, that is.
Go to YouTube. Search for the only existing recording of Hitler speaking with a normal voice. It dates from 1942, during his meeting with the Finnish military commander, Mannerheim. It is about 12 minutes long.
I listened to it while reading the subtitles (in English). His voice is surprisingly deep. That was the oddest German lesson I’ve ever ‘enjoyed’. It was absolutely riveting.