Many, but certainly not all. Redbook audio (along with tons of grainy low resolution FMV) was more common in the earlier days of the CD-ROM, when creators were

Many, but certainly not all. Redbook audio (along with tons of grainy low resolution FMV) was more common in the earlier days of the CD-ROM, when creators were trying to justify the format, but hadn't figured out more interesting ways to make use of the space.