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For Section 1 -- here are some sample bourdoons which can be used as bass accompaniment for your recorder melodies or you can create one of your own. A bourdoon is a repeating phrase that includes the home note (in this case C or E) and the fifth note of that scale (G and B). Remember bourdoons repeat so select one measure and one measure only from the above.
Did you remember to notate the bass in bass clef?