A Grammy Salute to 50 Years of Hip Hop, a CBS special that aired on Sunday, tops the Promo Mojo ranker for the week ended Dec. 10, making it TV's most promoted show. The network also takes third place for its new spin-off drama NCIS: Sydney, which had dominated the chart for the prior two weeks.

Rounding out the ranking are three cable networks, the first two with holiday programming: Hallmark Channel with original movie Christmas on Cherry Lane in second place, and AMC, with its So Many Santas Marathon in fourth. TNT hypes NBA Basketball in fifth.

Notably, A Grammy Salute to 50 Years of Hip Hop has the highest iSpot Attention Index (133) in the ranking, meaning viewers were on average highly likely to watch its promos all the way through (vs. interrupting viewing by changing the channel, pulling up the guide, fast-forwarding or turning off the TV).

Brief by Promax has partnered with Broadcasting & Cable and iSpot.tv on weekly chart Promo Mojo, offering data revealing the week's most-promoted programming ranked by TV ad impressions.

For more information about Promo Mojo — including the chart positions of promos beyond the top five — contact mediapartnerships@ispot.tv. Chart positions and other data may be updated in iSpot's database as additional airings information becomes available.

1) A Grammy Salute to 50 Years of Hip Hop, CBS

Impressions: 230,109,173

Interruption Rate: 0.88%

Attention Index: 133 (33% fewer interruptions than avg.)

Imp. Types: National 96%, Local 3%, VOD/OTT 1%

In-network Value: $2,337,094

Out-of-network Est. Spend: $0.00

2) Christmas on Cherry Lane, Hallmark Channel

Impressions: 168,870,534

Interruption Rate: 3.38%

Attention Index: 105 (5% fewer interruptions than avg.)

Imp. Types: National 99%, Local 1%, VOD/OTT 0%

In-network Value: $1,102,456

Out-of-network Est. Spend: $0.00

3) NCIS: Sydney, CBS

Impressions: 161,245,688

Interruption Rate: 1.00%

Attention Index: 90 (10% more interruptions than avg.)

Imp. Types: National 92%, Local 7%, VOD/OTT 1%

In-network Value: $602,248

Out-of-network Est. Spend: $234,972

4) So Many Santas Marathon, AMC

Impressions: 159,061,532

Interruption Rate: 1.84%

Attention Index: 120 (20% fewer interruptions than avg.)

Imp. Types: National 97%, Local 1%, VOD/OTT 2%

In-network Value: $674,337

Out-of-network Est. Spend: $46,750

5) NBA Basketball, TNT

Impressions: 145,643,742

Interruption Rate: 2.17%

Attention Index: 99 (1% more interruptions than avg.)

Imp. Types: National 97%, Local 1%, VOD/OTT 2%

In-network Value: $1,186,477

Out-of-network Est. Spend: $617,683

Data provided by iSpot.tv, The New Standard for TV Ad Measurement

Impressions - The total impressions within all US households including National Linear (Live & Time-shifted), VOD+OTT, and Local.

Interruption Rate - The percentage of devices that were present at the beginning of your ad but did not complete watching the ad. Actions that interrupt ad play include changing the channel, pulling up the guide, fast-forwarding, or turning off the TV. The Interruption rate is measured on a scale of 0 to 100%.

Attention Index - A comparison of your ad's Interruption Rate against your specific media placement. The Attention Index is measured on a scale of 0 to 200, where 100 is the average and means your ad is performing as expected.

Imp. Types - Impression types tracked include National (Live + Time-shifted), Local, VOD & OTT. See below for further details.

In-network Value - Estimated media value of in-network promos.

Out-of-network Spend - The estimated amount spent on TV airing time for this promo's spots during a given date range.

National: Live - A national promo which was viewed during live linear television broadcast or same day, via DVR or on-demand.

Local - A promo that was aired during a local ad break slot.

VOD - This includes promos that run in on-demand content past three days (i.e. do not contain the linear promo load)

OTT - On-demand streaming content (i.e. Hulu, Roku, Fire TV Stick, Chromecast).