Wednesday Primetime Results:

* At 8 p.m. ET, "Dateline NBC" (1.6/5 in 18-49, 7.1 million viewers overall) hit season highs for a Wednesday edition in adults 18-49, adults 25-54 (2.1 rating) and total viewers. In the time period, "Dateline" is #2 among ABC, CBS, NBC and Fox in 18-49 and 25-54 and #1 among those networks in total viewers.

* "Dateline" is up week to week by 14 percent in both 18-49 rating (1.6 vs. 1.4) and total viewers (7.091 million vs. 6.199 million). In 18-49, the Wednesday "Dateline" has grown week to week for the last two weeks in a row and in total viewers, "Dateline" has been up versus its prior Wednesday edition for the last four telecasts in a row.

* At 9 p.m. ET, "Healing in the Heartland: Relief Benefit Concert" (1.9/6 in 18-49, 8.6 million viewers overall) delivered the #1 total-viewer result of the night on ABC, CBS, NBC and Fox. "Healing in the Heartland: Relief Benefit Concert" equaled NBC's highest 18-49 rating in the time period since January 9 and generated the network's top total-viewer result in the hour since November 7, 2012.

* "Healing in the Heartland: Relief Benefit Concert," which was organized and headlined by Blake Shelton, featured Usher, Darius Rucker, Luke Bryan, Rascal Flatts and Ryan Tedder of OneRepublic, as well as Grammy Award-winning artists Miranda Lambert, Reba and Vince Gill. The concert was televised live at 9 p.m. ET on NBC and was also scheduled to run on cable networks Style, G4, Bravo, E! and CMT on either a live or delayed basis.

* At 10 p.m. ET, an encore telecast of "Chicago Fire" averaged a 0.9/3 in adults 18-49 and 3.8 million viewers overall.

* NBC is #2 for the night among ABC, CBS, NBC and Fox in 18-49 and #1 among those networks in total viewers.

In Late-Night Metered Markets Wednesday night:

* In Nielsen's 56 metered markets, household results were: "The Tonight Show with Jay Leno," 2.2/6 with an encore telecast; CBS's "Late Show with David Letterman," 2.3/6 with an encore; and ABC's "Jimmy Kimmel Live," 1.8/5 with an encore.

* In the 25 markets with Local People Meters, adult 18-49 Wednesday results were: "The Tonight Show with Jay Leno," 0.7/3 with an encore; "Late Show," 0.5/2 with an encore; and "Jimmy Kimmel Live," 0.7/3 with an encore.

* From 12:35-1:05 a.m. ET Wednesday night, ABC's "Nightline" averaged a 1.1/4 in metered-market households and a 0.4/2 in 18-49 in the Local People Meters.

* From 12:35-1:35 a.m. ET, "Late Night with Jimmy Fallon" (1.2/4 in metered-market households with an encore) tied CBS's first-run "Late Late Show with Craig Ferguson" (1.2/4). In the 25 markets with Local People Meters, "Late Night" (0.4/3 in 18-49 with an encore) topped "Late Late Show" (0.3/2).

* At 1:35 a.m., "Last Call with Carson Daly" averaged a 0.7/3 in metered-market households with an encore and a 0.2/2 in adults 18-49 in the 25 markets with local people meters.

NOTE: All ratings are "live plus same day" from Nielsen Media Research unless otherwise indicated.