Altogether rhymes with:
get-together, together, get-together, together, get-together, together, birdfeather, feather, get-together, grether, heather, leather, merriweather, nether, raether, sether, tether, together, weather, whether
get-together, together, get-together, together, get-together, together, birdfeather, feather, get-together, grether, heather, leather, merriweather, nether, raether, sether, tether, together, weather, whether