Quote from Robert Burns

My way is: I consider the poetic sentiment correspondent to my idea of the musical expression, then choose my theme, begin one stanza; when that is composed, which is generally the most difficult part of the business, I walk out, sit down now and then, look out for objects in nature around me that are in unison or harmony with the cogitations of my fancy, and workings of my bosom; humming every now and then the air, with the verses I have framed. (Letter to George Thomson, Sep 1793)