Originally Posted by
jobucats
As others have alluded, duet projects, especially for male and female vocalists, present extra challenges. Most of the time, arrangers have to account for the optimal key [[pitch) in which to place the vocalist singing. The female artist may sing a song in the key of C; however, when the male artists tries to sing it in that key, it doesn't work. The arrangers consider who is singing the melody line and who is singing the harmony line. That is why we often will hear modulations in a song: the female artist may be singing the lead on one verse while the male artist needs the song to be modulated [[to have the key changed) as he sings the lead on another verse.
Marvin Gaye, because his 'sweet range' was similar to Diana's, made it that their project together did not require many modulations of keys within their songs. Yes, Lurlean, there are exceptions.
Listen closely, there are some modulations of the keys on Julio and Diana's "All of You' which indicates that had they decided to do a full album together, it would have required a lot of crafty modulations/arranges and a lot of compromise between the two artists.
One cannot just pull out an instrumental track which had previously been assigned to someone else and expect another artist to be able to perform it in his/her optimal range. There are exceptions.
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