Rgarding the 'purism' of the Alto Sax , I (As a VERY Green Tradder) thought a 'Proper' Jazz Band could only have Soprano Sax and certainly NO Piano or Guitar ! Then I bought the early Riverside Album of King Oliver's March /April 1923 recordings . These were Louis Armstrong's first recordingse after he was invite North by Joe Oliver . Lil Harding on piano , Johnny St Cyr playing a Guitar tuned Six String Banjo and one Stump Evans playing Alto Sax on several tracks ! That put paid to all my 'Purist' pretensions !