The article below is about rhythm comparisons used in guitar music. It explains the two basic types of rhythmic groupings, simple and compound, and how each can be used as well as beat divisions and meters. It gives examples of each using images of sheet music to illustrate how each rhythmic grouping can be used with certain chords and note ratios. An interesting read for newbies.
Read the full article here:
Rhythm Workshop: Simple and Compound Rhythmic Groupings Demystified. Very cool.