Fixed Measure Widths

[Matthew Schulkind]

Sorry if this has been answered before, but I could not find it in the archive.

Is there a way to specify a fixed measure width throughout a piece, or
more prefereably have all the measures on a line be the same width?
Many fake/real books are written out this way, and I would like to be
able to duplicate this.

Also, is there a way to break every 4 measures automatically without
manually inserting \break?

Thanks,
Matthew Schulkind