How to Increase Google Places Conversions

Is there a category for guitar lessons? If yes, add it.

Add more photos. Name them with your keywords before you do so.

https://lh3.googleusercontent.com/--...2BExterior.jpg

The above is the url of one your photos. Notice that it ends in exterior.jpg?
If you'd had named it guitar-lessons-grand-rapids you'd have had Google robots count your page down for guitar lessons Grand Rapids.

Right a better description, to include your keywords yet be appealing.

I hope that this information will be of help to you.
It might be helpful if you add in the category of "Guitar Retailer". Also add that same information to your website in regards to selling of guitars and other musical instruments.

Here is the description from your website: 'Sign up today for a Free Guitar Lesson, Bass, Banjo, or Mandolin Private Music Lesson Teachers in Grand Rapids'

Here is the description from Guitar Center (which has the "A" spot): "Guitar Center is the world's largest musical instrument retailer. Shop Guitars, Bass, Drums, Amps, DJ Gear, Keyboards, Pro-Audio and more. Most orders ship free!"

They play up that they are a retailer. You do hold the "A" spot for searches done in the Grand Rapids area for the search term of "Guitar Lessons".

If you have never done so, try an Adwords campaign. If you have not done so in the past, Google can (you'll have to ask for it) provide you with a $100 adwords credit. Use their keyword selection to review your site and come up with all the various search terms, then set the area for the ads to be shown no more than 10 miles radius. After the fee credits are gone, look at the results and find out what search terms had the most impressions. Those are the keywords that people in your area are most interested in.

Almost forgot!
Put your phone number (in big, bold type) up by the business name. Also put in a call to action such as "Call us at...", or even "CALL US NOW".

Having Music Store Means Your targeted Audience is Local , So Competition is not Overloaded to Comes Within Top Search Results ..
Ok... You Wanna to Improve Google Place Ranking
Yes Its more critical with the evolvement of local listings , most popular Google Places, Here are Steps to get Ranking for Google page
On-page optimization: Use the correct geo-location in all on-page optimization.
Local Submissions: Submit your website/business information to local data providers
Claim Google Places listings as owner
Optimize Your Local Listing Account to 100%
Correct business information , Categories:
10 Ways to Improve Google Place Ranking

Its Better and Recommended to have A Website Designed For your business As Business whether Small Or large Earning benefits to having A website , through Which you can Extend Your business Visibility ...

Terry , You have Website too .. That's Good .. So Lets Discuss About Conversions From Website point of View ..
Most of Business owners Complaints or Worries for the Same ..
Conversions don’t come easy, and if your website doesn't assist it, potential buyers will leave.

So For Enhancing Conversions , their are Some Common Tips that Helps Every Business Like Electronics , MUSIC , garment etc

Here is Inforgraphics for Simpler Explanation , Shared by FATbit Technologies ..

Get more customers to write some positive reviews. Send them an incentive to do so (maybe 5-10% off the next lesson).

Also reply to the bad reviews. I hate to admit it but some bad reviews usually turns me off to a company. And I know it could be an pain in the butt customer or a rival business but if you reply to them it shows good customer service.