Limiting a melody to three comfortable notes can make rhythm and repetition easier to notice. The small pitch set leaves fewer choices, giving each remaining decision more room.
Choose the notes before the pattern
Use a familiar instrument or a comfortable humming range. Pick three pitches that are easy to repeat, then make a brief phrase using only them. Keep the volume comfortable and avoid stretching your voice to reach a note.
Record the sequence with letters or simple symbols if conventional notation is unfamiliar. Include repeated notes and pauses, since the pitch list alone will not preserve the phrase you made.
Change where the phrase rests
Play the phrase again but choose a different final note from the same set. Keep the earlier rhythm intact so the comparison stays manageable. Which ending feels more settled to you, and what might your first version have led you to expect?
There is no need to turn that response into a rule about all music. Your small phrase provides its own context. Save both versions and describe the difference in ordinary language; the exercise becomes a record of a compositional choice rather than a test of musical vocabulary.