This has to be one of the filthiest basslines in 'modern' rnb. I wasn't really convinced with the few other transcriptions so I gave this a go. Originally produced by Timbaland. Certified classic! If you're interested in learning it, I'd recommend youtube's slow down feature towards the end where the line is solo'd.
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![](https://i.ytimg.com/vi/MNJLs6QDLX8/maxresdefault.jpg)