It is not uncommon for jazz singers to include renditions of classic pop, folk, blues, and even classical music in their performances. For example, Ella Fitzgerald, considered one of the greatest jazz singers of all time, had a diverse repertoire that spanned jazz standards, show tunes, and pop songs from the Great American Songbook era.
Jazz singers often reinterpret these old tunes by infusing them with jazz elements such as improvisation, syncopation, and scat singing. Their unique vocal techniques and improvisational skills allow them to bring a fresh perspective and a jazz sensibility to non-jazz songs, creating new and captivating renditions that still retain the essence of the original.
By performing old tunes from various genres, jazz singers demonstrate their versatility and ability to connect with a wider audience. These interpretations also serve as a bridge between different musical styles, introducing jazz to a broader spectrum of listeners and promoting cross-cultural understanding and appreciation of diverse musical traditions.
So, yes, jazz singers frequently sing old tunes that are not originally jazz, showcasing their vocal prowess and adding a unique jazz touch to songs from various eras and genres.