Stop sound in dragEvent

beginners
#1 
void ofApp::dragEvent(ofDragInfo dragInfo) {
	if (dragInfo.files.size() > 0) {
		sound.assign(dragInfo.files.size(), ofSoundPlayer());
		for (int s = 0; s < dragInfo.files.size(); s++) {
			musicpath = dragInfo.files[s];
			sound[s].load(dragInfo.files[s]);
			sound[s].play();
			sound[s].setVolume(0.5);
		}
		dropped = true;
	}
}

This is my code where I drag music into OFX. I tried some different stuff to stop the sound with a ofxButton, but it is not possible to change the ‘sound[s]’ in the dragEvent.

What should I do?