Yes, yes, and yes! The accuracy in which we teach instrument parts is one of the things that makes us so unique. The parts you’re seeing on our site is what is happening on the album. That goes for vocal parts as well.
We go through the artist original stem tracks and isolate the parts so that we can learn and teach them exactly as they are on the album - no matter how hard or simple. Especially those parts that add a ton to a song, but are buried in the mix so much that it’s hard to tell exactly what happening.
*Note for vocal parts
With that said, many modern worship songs may only have two vocal parts; lead and tenor for example. As long as it doesn’t detract from the original feel of the song, we may add a third harmony part. Just to give you the option :)