I remember hearing them when I was younger but I didn't realize how good they were until I recently found them again clicking on random YouTube videos...
"Harden My Heart" is such a good song and the sax & guitar in it compliment each other in ways you wouldn't think they would. I have the same sentiment to harden my heart about love too, sometimes. She is a good sax player and singer...I was surprised by the musical talent in just this song so I went snooping for more songs by them.
"Talk To Me" is catchy and again, I notice the sax is not just a prop in a couple of their songs here'n'there...it's actually played like riffing a guitar and then there's cool guitar riffs in their songs, too. It's probably difficult to work a unique (non-rock) instrument like a sax into each of their songs, but they do. American Bandstand's Dick Clark comes in for a standing talk with the band and the leads are Rindy (Orinda) & Marv Ross. Why do crowds like saying GOOCH so much, btw?
"Find Another Fool" showcases her very unique voice, too...and her sound/look is very '80's. Even though it's disco-poppy, the group as a whole has a progressive rock feel, too. This song features a violin, much like some of my favorite prog-rock bands (UK & King Crimson) do. Love the line: "friends'n'lovers always come'n'go" and that was something I was writing into a story I'm making now. "Take Me To Heart" is another song, again with the '80's vibe, that feels like something that would be in some of my favorite Japanimations: A.D. Police Files, Bubblegum Crisis & Riding Bean. They all had a jazzy-rock + hair-metal feel that I think is very Quarterflash.
"Try To Make It True" has a lil' interview before the song that gives a tiny bit of insight on Quarteflash. This song is the most poppy with the repetitive chorus, but it's still a good song that shows a bit of the vocal harmony the band can have.
I really want to look into them more, but these above songs are now in my recent YouTube music rotation.