Strum or thrum should be used, and not drum, when the noisy and unskillful fingering of a musical instrument is meant.
She heard the thrum of the string, and then a piercing scream.
There was one Anchises, a twice five-fingered Trojan, that (as old stories say) used to thrum her jacket.
They had not heard the thrum of the motors on the roadway outside.
"thrum, thrum, thrum," the swing of oars; despite that the rhythm was muffled and subdued.
The man on the table who held the guitar began to thrum on the instrument.
Some thrum a musical instrument the livelong day, and, when they wake at night, proceed at once to their musical performance.
Perhaps he has returned from another world to thrum a harp, or it may be only a banjo.
When he touches Rossetti's lute his melody is blurred by the thrum of the strings that the Italian's fingers have so lately left.
I knelt on the deck and listened to the thrum of the diesel engines.
"play a stringed instrument," 1590s, from the noun (1550s), of imitative origin. Related: Thrummed; thrumming.