find the first closer match in your music folder and play it. The first word should be in the song filename, the others can be either in the filename or in the path, as for artist name

findAndPlay.sh

#!/bin/bash 

MUSIC_DIR="/media/Volume/Musica personale/"

find "$MUSIC_DIR" -iname "*$1*.mp3" -o -iname "*$1*.wma" -type f | while read line; do
	good=1;
	for arg in $@ ; do
		if [ $good -eq 1 ]; then
			echo $line | grep -i -q "$arg" 
			if [ $? -eq 1 ] ; then 
				good=0;
			fi
		fi 
	done
	if [ $good -eq 1 ]; then
		#echo $line
		mplayer -volume 75 "$line" </dev/tty
		#exit this subshell
		exit 1
	fi
done
#if song is not in MUSIC_DIR: play it form youtube
if [ $? -eq 0 ] ; then
	#echo "YOUTUBEEEEE!"
	mpsyt ."$@",1,q
fi
echo "Bye!"