What is the fine-grained topic of the following text: Back in 2016 they were planning an entire collaborative album together, even buying billboards reading, “Calabasas is the new Abu Dhabi.” However, Kanye later called Drake out during his infamous rant at the Sacramento, California stop of the Saint Pablo tour, souring their relationship. Only return the topic.
Kanye West and Drake's planned collaborative album and their soured relationship