Hello Molotophe . On this video, that you present, the harmonica used is a diatonic harmo (some notes are missing) that's why you have to alter with the mouth to obtain them. On this video, and to embellish the melody, it alters a passage by pronouncing ( hi youououou ( hi you ) by aspiring as if you wanted to immitate the whistle of a train. If you do not know I can help you. The melody, it will be necessary for you to listen and to listen again while playing to find this one (played by ear). The tablature will not give you the rhythm but the positions. The part played here is a sequence of chords. If I were you, I would improvise on its rhythmic accompaniment. If you had a harmo in G major it would be ideal, this one being the lowest. A bass harmonica is too expensive. to realize this, and if it can help you, go on youtube and look at the trios; you will have an idea of rhythmic. contact me, if you need. Friendship