Broadening your palette of vocal sounds can make you money as a session singer. Working with a producer to aim for the sound that he/she wants is a skill in itself. Top session singers are those that are able to provide many different aspects to their voice.
Your ability to sing backing vocals is one of the most a valuable assets to have. Those who have harmony knowledge and understanding will work so much more in the industry. So, practice at every given opportunity your ability to harmonise.
It is a real skill to be able to sensitively support what the lead vocalist is singing. If you find it hard to pick out harmonies, don’t worry as this certainly improves with practice and experience.
Previous students I’ve had have gone on to sing backing vocals for Adele, the Noisettes and have been part of Mark de Lisser’s ACM Gospel choir. They are the singers who will work long into the future. The bonus is that you can also develop your own career at the same time!