Singing “All I Need” should be easy for everyone. This song centers around the A in the middle of the staff. For me, this gives my voice a very relaxed sound and is easy to sing… However, it is also easy to fall a little flat, so watch out. The great thing about writing melodies in this range is it gives a lot of room for harmonies. Both men and women should be able to find easy to sing harmonies with this song. Feel free to experiment and if you need to adjust the key of the song to give it a brighter feel.