Earth isn't the only solar system world with an atmosphere. Not counting the giant planets which are virtually all atmosphere (although squished into liquid and solid forms deep inside the planets), there's Venus with its heavy atmosphere 93 times Earth's at sea level, Mars's much less flattening air at .59 atmospheres, Titan at 1.45 atmospheres, and Triton at a puny .000019 to .00004 atmospheres. Every other known solar system planetary atmosphere is so thin as to be nearly inconsequential in comparison, with the exception of Pluto's which only appears when it's closest to the Sun and freezes out farther out.
Of course, if we're going to be talking about air, some people might wonder what they might sound like on other worlds. While no space probes equipped with microphones have been sent out to snoop on alien winds, it is possible to model how the different air pressures would affect a person's voice. Tim Leighton of the University of Southampton in England has done so and provided Science News samples of his voice as it might sound on Venus and Titan. As an example, a speaker's vocal cords would vibrate slower in the Venerean atmosphere due to the denser atmosphere, but his voice would travel faster, making him seem smaller. Thus, someone on Venus would sound like a bass Smurf.
In my opinion, the changes aren't as dramatic as helium's chipmunk voices, falling more or less in the normal range of human voice patterns on Earth, but you'd want to compare it with the same voice on Earth to get an idea of what those changes are anyway. Perhaps some intrepid person skilled in manipulating sounds electronically can find a way to easily replicate these effects for anyone who can provide a voice sample.