If you were given a melody as well as lyrics it would be easier. You would be providing backing tracks. I do this for my students as part of their singing lessons but I spend a lot of time auditioning styles, changing instruments, soloists etc. I enjoy doing this but if I charged for the time involved it would be too expensive.

If you have only the lyrics you would have to write a melody, as Kevin said further up.
Melody writing is a craft in itself, so that's another thing to consider.

I think the opportunity is there if you work at it and advertise. I have seen ads from people along these lines.

If it's want you like doing, go for it! Nothing ventured nothing gained.


yjoh

[i]Music...a joy for life.