Both meadowlark species have a call, a rattle call, and a flight call. Have fun!
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A couple resources here:
http://pjdeye.blogspot.ca/2009/02/blackbird-calls-ii-orioles-and.html
http://pjdeye.blogspot.ca/2010/12/blackbird-flight-calls-ii-orioles-and.html
http://www.xeno-canto.org
Described as (Sibley Guide):
"sharp, electric dziit or jerZIK" for EAME;
"low, bell-like pluk; blackbird-like but more musical" for WEME.
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The rattle call:
Described as:
"hard, mechanical rattle ztttttttt" for EAME
"slow, dull rattle vidididididi" for WEME
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The flight call:
Described as:
"thin, rising veeet or rrink" for EAME
"slightly lower than Eastern" for WEME