“All That We Let In,” the Indigo Girls’ newest release, proves that even though they’ve been part of the music industry for more than two decades, they still bring something unique and fresh to the table. Their voices blend melodically together in pleasing arrangements that showcase dedication to their craft.

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Amy Ray and Emily Saliers wrote the lyrics and music for every song on the 11-track album. The songs alternate between each woman and showcase slight alterations in personal style. Considering their eight studio albums together, their techniques aren’t noticeably different.

The album starts strong with “Fill It Up,” which features environmentally conscious lyrics compared to human emotions. Running with this theme, the CD booklet has Web sites listed for “Global Exchange” and “Honor The Earth.” The influence of eco-friendly preservation is apparent. The second song, “Heartache for Everyone,” has a slightly ska feel and is the most radio-worthy track on the album.

After track four, things take a slower and more depressing turn. The rest of the songs range from beautifully composed love ballads to songs with a country feel. In “Dairy Queen,” the line, “I heard that you were drunk and mean down at the Dairy Queen,” is one of the few that lacks creativity.

The album tries to pick up the pace with “Tether,” which is closer to a power ballad than folk music, but reverts back to quiet meditation immediately after the final notes fill the air. Although slow, the melodies are still beautiful and relaxing.

The release comes with a bonus CD that showcases the Indigo Girls’ stage presence. The 30-minute DVD includes six songs that were performed live at The Bottom Line in New York City on Dec. 4.

“Rise up your dead/ There’s life in the old girl yet,” the Girls sing on the last track, “Rise Up.” Thus, the album ends on a peppy note, which proves that there’s still life left in this conscientious, earth-friendly duo.