Didn't Samba Di Amigo for the dreamcast with the maracca's come out in 1999 ? Or was that 2000 ?
Japanese arcade 1999, console release 2000... The Beamani games however have been available since 1997/1998 in the arcades and on the consoles respectively. In fact, I found the whole ruckus over Red Octane and 3rd party guitar controller makers quite amusing since Konami's been dealing with it for years rather well and had in fact been rather dependent on 3rd party instruments.
One caveat though is that Konami has never released any of the GuitarFreaks or DrumMania games in the US/North America. Usually you only see the arcade systems at the occasional rare and decent arcade or you import the PSone or PS2 titles (which my GF does extensively). The only reason I can think of why Konami never pursued it in the US, the percieved lack of interest and the difficulties of building a music catalog tailored to the US market. They did manage to do with North American releases of Karaoke Revolution though...
What's amusing is that a bunch of folks at Harmonix have long been fans of GuitarFreaks & DrumMania for a long time and those titles were inspirations to do Guitar Hero.