[Hackbraten]

> For example, which is easier, sight reading music with both hands, or sight reading each hand separately?

That highly depends on the performer and the musical properties of the work.

Sight reading a single voice can be harder than with both hands because the voice of one hand may not always give you a complete picture: what the tonal center and functions are, how a theme or sequence develops, and how the voices relate to each other.

[jb1991]

I mean, from a technical level, it’s hard to argue that playing a single voice, or single hand, requires less effort than sight reading multiple voices or two hands simultaneously.

[Hackbraten]

From a technical level, you’re obviously right.

But when sight reading, there’s a lot more going on than just technical skill. Depending on the person who is sight reading and which piece, playing both voices at the same time can, on an intellectual level, help tremendously with comprehension that it more than offsets the additional technical burden.