At the risk of making this a musical thread, here's one we wrote in 2010:

THERE'S AN APP FOR THAT

by Bev and Jerry Praver

1. You're lost and your wanting a chart or a map
    You need an address or a street
    Yet finding your bearings is simply a snap      
    Your iphone can help, it's really neat

chorus:
        There's an app for that, there's an app for that
        When you've a problem big or small
        There's an app for that, there's an app for that
        Download the one you need and then install

2. You're shopping for cheese and you don't have a clue
    Havarti or Stilton or Blue
    Just pull out your phone to learn just what to do
    The answer is waiting there for you

3. You're ready to jam, your guitar's out of tune
    Your strings have a mind of their own
    The answer's at hand you'll be joining in soon
    A tuner is stored inside your phone

4. You want to impress her by choosing the wine
    Tonight when you take her to dine
    Pretend you've a call, check the fruit of the vine
    She won't know you're just a philistine

5. Your flashlight was shining to show you the way
    But just then your batteries died
    But Apple is near they will help save the day
    Your iphone will surely be your guide         

6. You're having a baby, your suitcase is packed
    You wonder if this is the time
    Contractions are here and they need to be tracked
    Your iphone can help you - it's sublime

7. You're waiting to hear if the job will be yours
    You've been looking for work for a year
    No sound can be heard and no ringing occurs
    It's a dead zone, there is no signal here

Last chorus:
        
There's no app for that, there's no app for that
When you've a problem big or small
There's no app for that, there's no app for that
Your iPhone can't help you after all

Tune: Jesus Satisfies

Bev and Jerry