LA Brass Quintet (minus 1?)

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Per the note from Mr. Bobo in the first comment:

This recording was recovered a little over a year ago, It was recorded in Osaka, Japan in 1968. Most of the the repertoire is mostly played on 2 trumpets, basstrumpert and a contrabasstrumpet, which was built specifically for the Los Angeles Brass Quintet. These 4 trumpetes created a homogeneous blend and intensity that I I've never heard since. We were very young then.

Related:

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For those upset by a lack of tuba content...