Embodiments disclosed herein provide compositions, methods, and uses for respiratory syncytial viruses (RSV) and immunogenic compositions thereof. Certain embodiments provide RSV having cleavage-resistant mutated attachment (G) glycoproteins. In some embodiments, the cleavage-resistant G protein mutants increase production of live attenuated RSV in host cells. Also provided are methods for amplifying RSV in host cells, wherein the amplified RSV has full length G protein. In certain embodiments, the amplified RSV having full length G protein is formulated into immunogenic compositions, including vaccines. Other embodiments provide methods for inducing an effective immune response against RSV infection in a subject.