It will make for a smoother transcription process. Tapes designed for voice dictation filter out background noise. Music tapes are designed to pick up every possible sound, and they do. Chewing gum, eating and drinking sound very unappealing when magnified in someone's ear. Read my lips . . .
Microphones make a big difference in recording quality.
Use a good quality mic and speak distinctly and clearly. Practice makes perfect. For telephone taping, practice with a friend first to make sure the tape picks up both speakers. It saves time and confusion as to where to start transcribing. Identity Crisis Identify yourself on the tape, as well as any other speakers, if there is going to be a group discussion.