Hengameh Akhavan's voice was powerful, crystal clear and emotionally textured in an earthy way reminiscent of Ghamar-Molok Vaziri. Some even held her in higher regard than Parissa, a very talented singer in her own right and decidedly more photogenic.  Here's Hengameh's rendition of Morgh-e Sahar with maestro Lotfi on setar circa late Seventies. For my money this ranks nearly as high as maestro Shajarian's version of this old standard.