This is what you get when you cross a histogram and piano keys to show note distribution of songs. It's the pianogram. View examples such as Fur Elise or the…
histogram

Pianogram

How to Read and Use Histograms in R
The chart type often goes overlooked because people don't understand them. Maybe this will help.
Projects

Changing price of food items and horizon graphs
The rarely used chart type for time series data is actually quite nice, once you get the hang of it. 
Reviving the Statistical Atlas of the United States with New Data
Ever since I found out about the Statistical Atlas of the United States, it annoyed me that there wasn't one in the works for the 2010 Census due to cuts in funding. So I recreated the original 1870 Atlas using today's publicly available data. 
Brewing Multivariate Beer
I was toying around with the idea of multivariate beer, where the ingredients varied by county demographics. Could I taste the difference? Here's how the experiment went. 
Sandwich Place Geography
Subway dominates the sandwich chains. 
Mapping the Most Common Races
Select one or more races for a quick comparison. Counties are colored by the most prevalent.
Tutorials

How to Make Horizon Graphs in R
The relatively new and lesser known time series visualization can be useful if you know what you're looking at, and they take up a lot less space. 
How to Make Variable Width Bar Charts in R
The code to create these bar chart variations is almost the same as if you were to make a standard bar chart. But make sure you get the math right. 
A Course for Visualization in R, Taking You From Beginner to Advanced
If you're new to R or coding in general, it can be a challenge to figure out where you're going. Where to start? What to learn next? There's a benefit to more guided instruction. Here's a course to help take you from beginner to advanced. 
How to Make Dot Plots in R
It's easy to draw dots. The challenge is to make them meaningful and readable. 
How to Make Line Charts in R
Learn to draw lines wherever and however you want, and you've got yourself some flexibility. 
R Cheat Sheet and Guide for Graphical Parameters
You can customize graphics in R withpar()
, but the docs are mostly text and just organized alphabetically. Here is a more visual reference, categorized by what you can change. Plus, a onepage printout. 
How to Make and Use Bar Charts in R
The chart type seems simple enough, but there sure are a lot of bad ones out there. Get yourself out of default mode. 
Making an Interactive Map with Category Filters
Let readers focus on the regions they care about to make their own comparisons and conclusions. 
Loading Data and Basic Formatting in R
It might not be sexy, but you have to load your data and get it in the right format before you can visualize it. Here are the basics, which might be all you need. 
Choropleth Maps and Shapefiles in R
Fill those empty polygons with color, based on shapefile or external data.
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