Jingles are slogans set to music.  Just like a slogan, a jingle should have some figures of speech that make it catchy.  The tune should be simple and upbeat.  An effective use of a jingle can be to have one line that stands on its own, and a few more lines that rhyme and form the verse of a song used in advertising on TV and radio.  Probably some of the best jingles came from the golden years of radio and television when most advertising was done through these media. 

Some examples of classic jingles from successful ad campaigns include:

Let Hertz put you in the driver's seat.

The quicker picker upper. (Bounty)

Let your fingers do the walking through the Yellow Pages.

Like a rock. (Chev Trucks)

Like a good neighbour, State Farm is there.

For all you do, this Bud's for you.

You deserve a break today. (McDonalds)

See the USA, in your Chevrolet.

What would you do for a Klondike bar?

It's good mood food. (Arby's)

As you read over the list, many of the tunes from these jingles probably popped into your head, especially if you were born before 1980.  Some of the jingles were used for decades, which shows how effective they can be to establish a brand.