The crowing of a rooster heralds the start of a new day in many rural areas. While the "cockle-doodle-doo" of a rooster is iconic, other birds like morning doves, bluebirds and robins also signal the sunrise. The tweets and chirps of these birds can be found on many different sound effect mixes. The traffic of an urban street would not be appropriate for a morning on the farm, but the distant backfire of a pickup truck is a familiar and fitting sound effect for a country morning.
For many city-dwellers, the rising sun means it's time for the morning commute to work. A blend of light traffic noises (the whir of an engine, an occasional horn honk) is appropriate for an urban morning setting. An aggressive, beeping alarm clock is audio shorthand for interrupted sleep and is especially effective if the alarm gives way to the bright and cheery sounds of a morning radio talk show. The distant calls of shop keepers opening their stores is also an excellent sound effect an urban morning.
The sounds of coffee bubbling in a percolator or bacon sizzling in a hot frying pan are perfect accompaniment to a morning scene set in a diner or kitchen. If your scene is set in a busy café, the murmur of diners in conversation creates the impression of a bustling breakfast hotspot even if there are only a handful of actors onstage. Silverware clinking against plates also adds to the ambiance of a morning breakfast scene.
"The Calling of the Cows" movement from Giacchino Rossini's famous "William Tell Overture" features a flute that trills like the call of an early morning bird and an English horn that echoes the lowing of cattle. Edvard Grieg's "Morning Mood" from the "Peer Gynt" suites evokes the softness of a Norwegian spring morning. Both pieces have been used in countless commercials and cartoons to set the scene for a peaceful morning. Playing just a snippet of either piece establishes that the following scene takes place in the morning.