Leonardo "Flaco" Jiménez is an American singer, songwriter and accordionist from San Antonio, Texas. He is known for playing Norteño, Tex Mex and Tejano music. Jiménez has been a solo performer and session musician, as well as a member of the Texas Tornados and Los Super Seven.

Tejano music, also known as Tex-Mex music, is a popular music style fusing Mexican and US influences. Typically, Tejano combines Mexican Spanish vocal styles with dance rhythms from Czech, Austrian and German genres – particularly polka or waltz. Tejano music is traditionally played by small groups featuring accordion and guitar or bajo sexto. Its evolution began in northern Mexico.