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I thin k you are absolutely 100 per cent correct mouse, quality rather than quantity. Its easy to add tunes once the intonation sinks in, very,very good advice. I personally would practice just a couple of tunes, both very slowly and paying complete attention to intonation. The rest of the practice would be scales and bow exercises. or better stll get the string builder books by Applebaum, they are excellent, and very cheap, they take You through everything, give exercises and tunes as you progress, I have them all ,worth there weight in gold in my opinion.