I play the flute! You can buy actual flute books with assorted Beatles songs in, even some with playalong backing tracks- probably from most decent sized music shops, or from the internet. But I have the 'Beatles Complete Scores' which is all their songs with all instruments written in so I just play the treble cleff tune on my flute (but because it isn't specifically designed for flute it sometimes goes too low down for the flute's register, but you can always shove it up and octave!)